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type { AgentMessage } from \"@earendil-works/pi-agent-core\";\nimport type { ImageContent, Message, TextContent } from \"@earendil-works/pi-ai\";\nimport { randomUUID } from \"crypto\";\nimport {\n\tappendFileSync,\n\tcloseSync,\n\texistsSync,\n\tmkdirSync,\n\topenSync,\n\treaddirSync,\n\treadFileSync,\n\treadSync,\n\tstatSync,\n\twriteFileSync,\n} from \"fs\";\nimport { readdir, readFile, stat } from \"fs/promises\";\nimport { join, resolve } from \"path\";\nimport { v7 as uuidv7 } from \"uuid\";\nimport { getAgentDir as getDefaultAgentDir, getSessionsDir } from \"../config.js\";\nimport {\n\ttype BashExecutionMessage,\n\ttype CustomMessage,\n\tcreateBranchSummaryMessage,\n\tcreateCompactionSummaryMessage,\n\tcreateCustomMessage,\n} from \"./messages.js\";\n\nexport const CURRENT_SESSION_VERSION = 3;\n\nexport interface SessionHeader {\n\ttype: \"session\";\n\tversion?: number; // v1 sessions don't have this\n\tid: string;\n\ttimestamp: string;\n\tcwd: string;\n\tparentSession?: string;\n}\n\nexport interface NewSessionOptions {\n\tid?: string;\n\tparentSession?: string;\n}\n\nexport interface SessionEntryBase {\n\ttype: string;\n\tid: string;\n\tparentId: string | null;\n\ttimestamp: string;\n}\n\nexport interface SessionMessageEntry extends SessionEntryBase {\n\ttype: \"message\";\n\tmessage: AgentMessage;\n}\n\nexport interface ThinkingLevelChangeEntry extends SessionEntryBase {\n\ttype: \"thinking_level_change\";\n\tthinkingLevel: string;\n}\n\nexport interface ModelChangeEntry extends SessionEntryBase {\n\ttype: \"model_change\";\n\tprovider: string;\n\tmodelId: string;\n}\n\nexport interface CompactionEntry<T = unknown> extends SessionEntryBase {\n\ttype: \"compaction\";\n\tsummary: string;\n\tfirstKeptEntryId: string;\n\ttokensBefore: number;\n\t/** Extension-specific data (e.g., ArtifactIndex, version markers for structured compaction) */\n\tdetails?: T;\n\t/** True if generated by an extension, undefined/false if pi-generated (backward compatible) */\n\tfromHook?: boolean;\n}\n\nexport interface BranchSummaryEntry<T = unknown> extends SessionEntryBase {\n\ttype: \"branch_summary\";\n\tfromId: string;\n\tsummary: string;\n\t/** Extension-specific data (not sent to LLM) */\n\tdetails?: T;\n\t/** True if generated by an extension, false if pi-generated */\n\tfromHook?: boolean;\n}\n\n/**\n * Custom entry for extensions to store extension-specific data in the session.\n * Use customType to identify your extension's entries.\n *\n * Purpose: Persist extension state across session reloads. 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Empty string for old sessions. */\n\tcwd: string;\n\t/** User-defined display name from session_info entries. */\n\tname?: string;\n\t/** Path to the parent session (if this session was forked). */\n\tparentSessionPath?: string;\n\tcreated: Date;\n\tmodified: Date;\n\tmessageCount: number;\n\tfirstMessage: string;\n\tallMessagesText: string;\n}\n\nexport type ReadonlySessionManager = Pick<\n\tSessionManager,\n\t| \"getCwd\"\n\t| \"getSessionDir\"\n\t| \"getSessionId\"\n\t| \"getSessionFile\"\n\t| \"getLeafId\"\n\t| \"getLeafEntry\"\n\t| \"getEntry\"\n\t| \"getLabel\"\n\t| \"getBranch\"\n\t| \"getHeader\"\n\t| \"getEntries\"\n\t| \"getTree\"\n\t| \"getSessionName\"\n>;\n\nfunction createSessionId(): string {\n\treturn uuidv7();\n}\n\n/** Generate a unique short ID (8 hex chars, collision-checked) */\nfunction generateId(byId: { has(id: string): boolean }): string {\n\tfor (let i = 0; i < 100; i++) {\n\t\tconst id = randomUUID().slice(0, 8);\n\t\tif (!byId.has(id)) return id;\n\t}\n\t// Fallback to full UUID if somehow we have collisions\n\treturn randomUUID();\n}\n\n/** Migrate v1 → v2: add id/parentId tree structure. Mutates in place. */\nfunction migrateV1ToV2(entries: FileEntry[]): void {\n\tconst ids = new Set<string>();\n\tlet prevId: string | null = null;\n\n\tfor (const entry of entries) {\n\t\tif (entry.type === \"session\") {\n\t\t\tentry.version = 2;\n\t\t\tcontinue;\n\t\t}\n\n\t\tentry.id = generateId(ids);\n\t\tentry.parentId = prevId;\n\t\tprevId = entry.id;\n\n\t\t// Convert firstKeptEntryIndex to firstKeptEntryId for compaction\n\t\tif (entry.type === \"compaction\") {\n\t\t\tconst comp = entry as CompactionEntry & { firstKeptEntryIndex?: number };\n\t\t\tif (typeof comp.firstKeptEntryIndex === \"number\") {\n\t\t\t\tconst targetEntry = entries[comp.firstKeptEntryIndex];\n\t\t\t\tif (targetEntry && targetEntry.type !== \"session\") {\n\t\t\t\t\tcomp.firstKeptEntryId = targetEntry.id;\n\t\t\t\t}\n\t\t\t\tdelete comp.firstKeptEntryIndex;\n\t\t\t}\n\t\t}\n\t}\n}\n\n/** Migrate v2 → v3: rename hookMessage role to custom. Mutates in place. */\nfunction migrateV2ToV3(entries: FileEntry[]): void {\n\tfor (const entry of entries) {\n\t\tif (entry.type === \"session\") {\n\t\t\tentry.version = 3;\n\t\t\tcontinue;\n\t\t}\n\n\t\t// Update message entries with hookMessage role\n\t\tif (entry.type === \"message\") {\n\t\t\tconst msgEntry = entry as SessionMessageEntry;\n\t\t\tif (msgEntry.message && (msgEntry.message as { role: string }).role === \"hookMessage\") {\n\t\t\t\t(msgEntry.message as { role: string }).role = \"custom\";\n\t\t\t}\n\t\t}\n\t}\n}\n\n/**\n * Run all necessary migrations to bring entries to current version.\n * Mutates entries in place. Returns true if any migration was applied.\n */\nfunction migrateToCurrentVersion(entries: FileEntry[]): boolean {\n\tconst header = entries.find((e) => e.type === \"session\") as SessionHeader | undefined;\n\tconst version = header?.version ?? 1;\n\n\tif (version >= CURRENT_SESSION_VERSION) return false;\n\n\tif (version < 2) migrateV1ToV2(entries);\n\tif (version < 3) migrateV2ToV3(entries);\n\n\treturn true;\n}\n\n/** Exported for testing */\nexport function migrateSessionEntries(entries: FileEntry[]): void {\n\tmigrateToCurrentVersion(entries);\n}\n\n/** Exported for compaction.test.ts */\nexport function parseSessionEntries(content: string): FileEntry[] {\n\tconst entries: FileEntry[] = [];\n\tconst lines = content.trim().split(\"\\n\");\n\n\tfor (const line of lines) {\n\t\tif (!line.trim()) continue;\n\t\ttry {\n\t\t\tconst entry = JSON.parse(line) as FileEntry;\n\t\t\tentries.push(entry);\n\t\t} catch {\n\t\t\t// Skip malformed lines\n\t\t}\n\t}\n\n\treturn entries;\n}\n\nexport function getLatestCompactionEntry(entries: SessionEntry[]): CompactionEntry | null {\n\tfor (let i = entries.length - 1; i >= 0; i--) {\n\t\tif (entries[i].type === \"compaction\") {\n\t\t\treturn entries[i] as CompactionEntry;\n\t\t}\n\t}\n\treturn null;\n}\n\n/**\n * Build the session context from entries using tree traversal.\n * If leafId is provided, walks from that entry to root.\n * Handles compaction and branch summaries along the path.\n */\nexport function buildSessionContext(\n\tentries: SessionEntry[],\n\tleafId?: string | null,\n\tbyId?: Map<string, SessionEntry>,\n): SessionContext {\n\t// Build uuid index if not available\n\tif (!byId) {\n\t\tbyId = new Map<string, SessionEntry>();\n\t\tfor (const entry of entries) {\n\t\t\tbyId.set(entry.id, entry);\n\t\t}\n\t}\n\n\t// Find leaf\n\tlet leaf: SessionEntry | undefined;\n\tif (leafId === null) {\n\t\t// Explicitly null - return no messages (navigated to before first entry)\n\t\treturn { messages: [], thinkingLevel: \"off\", model: null };\n\t}\n\tif (leafId) {\n\t\tleaf = byId.get(leafId);\n\t}\n\tif (!leaf) {\n\t\t// Fallback to last entry (when leafId is undefined)\n\t\tleaf = entries[entries.length - 1];\n\t}\n\n\tif (!leaf) {\n\t\treturn { messages: [], thinkingLevel: \"off\", model: null };\n\t}\n\n\t// Walk from leaf to root, collecting path\n\tconst path: SessionEntry[] = [];\n\tlet current: SessionEntry | undefined = leaf;\n\twhile (current) {\n\t\tpath.unshift(current);\n\t\tcurrent = current.parentId ? byId.get(current.parentId) : undefined;\n\t}\n\n\t// Extract settings and find compaction\n\tlet thinkingLevel = \"off\";\n\tlet model: { provider: string; modelId: string } | null = null;\n\tlet compaction: CompactionEntry | null = null;\n\n\tfor (const entry of path) {\n\t\tif (entry.type === \"thinking_level_change\") {\n\t\t\tthinkingLevel = entry.thinkingLevel;\n\t\t} else if (entry.type === \"model_change\") {\n\t\t\tmodel = { provider: entry.provider, modelId: entry.modelId };\n\t\t} else if (entry.type === \"message\" && entry.message.role === \"assistant\") {\n\t\t\tmodel = { provider: entry.message.provider, modelId: entry.message.model };\n\t\t} else if (entry.type === \"compaction\") {\n\t\t\tcompaction = entry;\n\t\t}\n\t}\n\n\t// Build messages and collect corresponding entries\n\t// When there's a compaction, we need to:\n\t// 1. Emit summary first (entry = compaction)\n\t// 2. Emit kept messages (from firstKeptEntryId up to compaction)\n\t// 3. Emit messages after compaction\n\tconst messages: AgentMessage[] = [];\n\n\tconst appendMessage = (entry: SessionEntry) => {\n\t\tif (entry.type === \"message\") {\n\t\t\tmessages.push(entry.message);\n\t\t} else if (entry.type === \"custom_message\") {\n\t\t\tmessages.push(\n\t\t\t\tcreateCustomMessage(entry.customType, entry.content, entry.display, entry.details, entry.timestamp),\n\t\t\t);\n\t\t} else if (entry.type === \"branch_summary\" && entry.summary) {\n\t\t\tmessages.push(createBranchSummaryMessage(entry.summary, entry.fromId, entry.timestamp));\n\t\t}\n\t};\n\n\tif (compaction) {\n\t\t// Emit summary first\n\t\tmessages.push(createCompactionSummaryMessage(compaction.summary, compaction.tokensBefore, compaction.timestamp));\n\n\t\t// Find compaction index in path\n\t\tconst compactionIdx = path.findIndex((e) => e.type === \"compaction\" && e.id === compaction.id);\n\n\t\t// Emit kept messages (before compaction, starting from firstKeptEntryId)\n\t\tlet foundFirstKept = false;\n\t\tfor (let i = 0; i < compactionIdx; i++) {\n\t\t\tconst entry = path[i];\n\t\t\tif (entry.id === compaction.firstKeptEntryId) {\n\t\t\t\tfoundFirstKept = true;\n\t\t\t}\n\t\t\tif (foundFirstKept) {\n\t\t\t\tappendMessage(entry);\n\t\t\t}\n\t\t}\n\n\t\t// Emit messages after compaction\n\t\tfor (let i = compactionIdx + 1; i < path.length; i++) {\n\t\t\tconst entry = path[i];\n\t\t\tappendMessage(entry);\n\t\t}\n\t} else {\n\t\t// No compaction - emit all messages, handle branch summaries and custom messages\n\t\tfor (const entry of path) {\n\t\t\tappendMessage(entry);\n\t\t}\n\t}\n\n\treturn { messages, thinkingLevel, model };\n}\n\n/**\n * Compute the default session directory for a cwd.\n * Encodes cwd into a safe directory name under ~/.pi/agent/sessions/.\n */\nexport function getDefaultSessionDir(cwd: string, agentDir: string = getDefaultAgentDir()): string {\n\tconst safePath = `--${cwd.replace(/^[/\\\\]/, \"\").replace(/[/\\\\:]/g, \"-\")}--`;\n\tconst sessionDir = join(agentDir, \"sessions\", safePath);\n\tif (!existsSync(sessionDir)) {\n\t\tmkdirSync(sessionDir, { recursive: true });\n\t}\n\treturn sessionDir;\n}\n\n/** Exported for testing */\nexport function loadEntriesFromFile(filePath: string): FileEntry[] {\n\tif (!existsSync(filePath)) return [];\n\n\tconst content = readFileSync(filePath, \"utf8\");\n\tconst entries: FileEntry[] = [];\n\tconst lines = content.trim().split(\"\\n\");\n\n\tfor (const line of lines) {\n\t\tif (!line.trim()) continue;\n\t\ttry {\n\t\t\tconst entry = JSON.parse(line) as FileEntry;\n\t\t\tentries.push(entry);\n\t\t} catch {\n\t\t\t// Skip malformed lines\n\t\t}\n\t}\n\n\t// Validate session header\n\tif (entries.length === 0) return entries;\n\tconst header = entries[0];\n\tif (header.type !== \"session\" || typeof (header as any).id !== \"string\") {\n\t\treturn [];\n\t}\n\n\treturn entries;\n}\n\nfunction isValidSessionFile(filePath: string): boolean {\n\ttry {\n\t\tconst fd = openSync(filePath, \"r\");\n\t\tconst buffer = Buffer.alloc(512);\n\t\tconst bytesRead = readSync(fd, buffer, 0, 512, 0);\n\t\tcloseSync(fd);\n\t\tconst firstLine = buffer.toString(\"utf8\", 0, bytesRead).split(\"\\n\")[0];\n\t\tif (!firstLine) return false;\n\t\tconst header = JSON.parse(firstLine);\n\t\treturn header.type === \"session\" && typeof header.id === \"string\";\n\t} catch {\n\t\treturn false;\n\t}\n}\n\n/** Exported for testing */\nexport function findMostRecentSession(sessionDir: string): string | null {\n\ttry {\n\t\tconst files = readdirSync(sessionDir)\n\t\t\t.filter((f) => f.endsWith(\".jsonl\"))\n\t\t\t.map((f) => join(sessionDir, f))\n\t\t\t.filter(isValidSessionFile)\n\t\t\t.map((path) => ({ path, mtime: statSync(path).mtime }))\n\t\t\t.sort((a, b) => b.mtime.getTime() - a.mtime.getTime());\n\n\t\treturn files[0]?.path || null;\n\t} catch {\n\t\treturn null;\n\t}\n}\n\nfunction isMessageWithContent(message: AgentMessage): message is Message {\n\treturn typeof (message as Message).role === \"string\" && \"content\" in message;\n}\n\nfunction extractTextContent(message: Message): string {\n\tconst content = message.content;\n\tif (typeof content === \"string\") {\n\t\treturn content;\n\t}\n\treturn content\n\t\t.filter((block): block is TextContent => block.type === \"text\")\n\t\t.map((block) => block.text)\n\t\t.join(\" \");\n}\n\nfunction getLastActivityTime(entries: FileEntry[]): number | undefined {\n\tlet lastActivityTime: number | undefined;\n\n\tfor (const entry of entries) {\n\t\tif (entry.type !== \"message\") continue;\n\n\t\tconst message = (entry as SessionMessageEntry).message;\n\t\tif (!isMessageWithContent(message)) continue;\n\t\tif (message.role !== \"user\" && message.role !== \"assistant\") continue;\n\n\t\tconst msgTimestamp = (message as { timestamp?: number }).timestamp;\n\t\tif (typeof msgTimestamp === \"number\") {\n\t\t\tlastActivityTime = Math.max(lastActivityTime ?? 0, msgTimestamp);\n\t\t\tcontinue;\n\t\t}\n\n\t\tconst entryTimestamp = (entry as SessionEntryBase).timestamp;\n\t\tif (typeof entryTimestamp === \"string\") {\n\t\t\tconst t = new Date(entryTimestamp).getTime();\n\t\t\tif (!Number.isNaN(t)) {\n\t\t\t\tlastActivityTime = Math.max(lastActivityTime ?? 0, t);\n\t\t\t}\n\t\t}\n\t}\n\n\treturn lastActivityTime;\n}\n\nfunction getSessionModifiedDate(entries: FileEntry[], header: SessionHeader, statsMtime: Date): Date {\n\tconst lastActivityTime = getLastActivityTime(entries);\n\tif (typeof lastActivityTime === \"number\" && lastActivityTime > 0) {\n\t\treturn new Date(lastActivityTime);\n\t}\n\n\tconst headerTime = typeof header.timestamp === \"string\" ? new Date(header.timestamp).getTime() : NaN;\n\treturn !Number.isNaN(headerTime) ? new Date(headerTime) : statsMtime;\n}\n\nasync function buildSessionInfo(filePath: string): Promise<SessionInfo | null> {\n\ttry {\n\t\tconst content = await readFile(filePath, \"utf8\");\n\t\tconst entries: FileEntry[] = [];\n\t\tconst lines = content.trim().split(\"\\n\");\n\n\t\tfor (const line of lines) {\n\t\t\tif (!line.trim()) continue;\n\t\t\ttry {\n\t\t\t\tentries.push(JSON.parse(line) as FileEntry);\n\t\t\t} catch {\n\t\t\t\t// Skip malformed lines\n\t\t\t}\n\t\t}\n\n\t\tif (entries.length === 0) return null;\n\t\tconst header = entries[0];\n\t\tif (header.type !== \"session\") return null;\n\n\t\tconst stats = await stat(filePath);\n\t\tlet messageCount = 0;\n\t\tlet firstMessage = \"\";\n\t\tconst allMessages: string[] = [];\n\t\tlet name: string | undefined;\n\n\t\tfor (const entry of entries) {\n\t\t\t// Extract session name (use latest, including explicit clears)\n\t\t\tif (entry.type === \"session_info\") {\n\t\t\t\tconst infoEntry = entry as SessionInfoEntry;\n\t\t\t\tname = infoEntry.name?.trim() || undefined;\n\t\t\t}\n\n\t\t\tif (entry.type !== \"message\") continue;\n\t\t\tmessageCount++;\n\n\t\t\tconst message = (entry as SessionMessageEntry).message;\n\t\t\tif (!isMessageWithContent(message)) continue;\n\t\t\tif (message.role !== \"user\" && message.role !== \"assistant\") continue;\n\n\t\t\tconst textContent = extractTextContent(message);\n\t\t\tif (!textContent) continue;\n\n\t\t\tallMessages.push(textContent);\n\t\t\tif (!firstMessage && message.role === \"user\") {\n\t\t\t\tfirstMessage = textContent;\n\t\t\t}\n\t\t}\n\n\t\tconst cwd = typeof (header as SessionHeader).cwd === \"string\" ? (header as SessionHeader).cwd : \"\";\n\t\tconst parentSessionPath = (header as SessionHeader).parentSession;\n\n\t\tconst modified = getSessionModifiedDate(entries, header as SessionHeader, stats.mtime);\n\n\t\treturn {\n\t\t\tpath: filePath,\n\t\t\tid: (header as SessionHeader).id,\n\t\t\tcwd,\n\t\t\tname,\n\t\t\tparentSessionPath,\n\t\t\tcreated: new Date((header as SessionHeader).timestamp),\n\t\t\tmodified,\n\t\t\tmessageCount,\n\t\t\tfirstMessage: firstMessage || \"(no messages)\",\n\t\t\tallMessagesText: allMessages.join(\" \"),\n\t\t};\n\t} catch {\n\t\treturn null;\n\t}\n}\n\nexport type SessionListProgress = (loaded: number, total: number) => void;\n\nasync function listSessionsFromDir(\n\tdir: string,\n\tonProgress?: SessionListProgress,\n\tprogressOffset = 0,\n\tprogressTotal?: number,\n): Promise<SessionInfo[]> {\n\tconst sessions: SessionInfo[] = [];\n\tif (!existsSync(dir)) {\n\t\treturn sessions;\n\t}\n\n\ttry {\n\t\tconst dirEntries = await readdir(dir);\n\t\tconst files = dirEntries.filter((f) => f.endsWith(\".jsonl\")).map((f) => join(dir, f));\n\t\tconst total = progressTotal ?? files.length;\n\n\t\tlet loaded = 0;\n\t\tconst results = await Promise.all(\n\t\t\tfiles.map(async (file) => {\n\t\t\t\tconst info = await buildSessionInfo(file);\n\t\t\t\tloaded++;\n\t\t\t\tonProgress?.(progressOffset + loaded, total);\n\t\t\t\treturn info;\n\t\t\t}),\n\t\t);\n\t\tfor (const info of results) {\n\t\t\tif (info) {\n\t\t\t\tsessions.push(info);\n\t\t\t}\n\t\t}\n\t} catch {\n\t\t// Return empty list on error\n\t}\n\n\treturn sessions;\n}\n\n/**\n * Manages conversation sessions as append-only trees stored in JSONL files.\n *\n * Each session entry has an id and parentId forming a tree structure. The \"leaf\"\n * pointer tracks the current position. Appending creates a child of the current leaf.\n * Branching moves the leaf to an earlier entry, allowing new branches without\n * modifying history.\n *\n * Use buildSessionContext() to get the resolved message list for the LLM, which\n * handles compaction summaries and follows the path from root to current leaf.\n */\nexport class SessionManager {\n\tprivate sessionId: string = \"\";\n\tprivate sessionFile: string | undefined;\n\tprivate sessionDir: string;\n\tprivate cwd: string;\n\tprivate persist: boolean;\n\tprivate flushed: boolean = false;\n\tprivate fileEntries: FileEntry[] = [];\n\tprivate byId: Map<string, SessionEntry> = new Map();\n\tprivate labelsById: Map<string, string> = new Map();\n\tprivate labelTimestampsById: Map<string, string> = new Map();\n\tprivate leafId: string | null = null;\n\n\tprivate constructor(cwd: string, sessionDir: string, sessionFile: string | undefined, persist: boolean) {\n\t\tthis.cwd = cwd;\n\t\tthis.sessionDir = sessionDir;\n\t\tthis.persist = persist;\n\t\tif (persist && sessionDir && !existsSync(sessionDir)) {\n\t\t\tmkdirSync(sessionDir, { recursive: true });\n\t\t}\n\n\t\tif (sessionFile) {\n\t\t\tthis.setSessionFile(sessionFile);\n\t\t} else {\n\t\t\tthis.newSession();\n\t\t}\n\t}\n\n\t/** Switch to a different session file (used for resume and branching) */\n\tsetSessionFile(sessionFile: string): void {\n\t\tthis.sessionFile = resolve(sessionFile);\n\t\tif (existsSync(this.sessionFile)) {\n\t\t\tthis.fileEntries = loadEntriesFromFile(this.sessionFile);\n\n\t\t\t// If file was empty or corrupted (no valid header), truncate and start fresh\n\t\t\t// to avoid appending messages without a session header (which breaks the session)\n\t\t\tif (this.fileEntries.length === 0) {\n\t\t\t\tconst explicitPath = this.sessionFile;\n\t\t\t\tthis.newSession();\n\t\t\t\tthis.sessionFile = explicitPath;\n\t\t\t\tthis._rewriteFile();\n\t\t\t\tthis.flushed = true;\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst header = this.fileEntries.find((e) => e.type === \"session\") as SessionHeader | undefined;\n\t\t\tthis.sessionId = header?.id ?? createSessionId();\n\n\t\t\tif (migrateToCurrentVersion(this.fileEntries)) {\n\t\t\t\tthis._rewriteFile();\n\t\t\t}\n\n\t\t\tthis._buildIndex();\n\t\t\tthis.flushed = true;\n\t\t} else {\n\t\t\tconst explicitPath = this.sessionFile;\n\t\t\tthis.newSession();\n\t\t\tthis.sessionFile = explicitPath; // preserve explicit path from --session flag\n\t\t}\n\t}\n\n\tnewSession(options?: NewSessionOptions): string | undefined {\n\t\tthis.sessionId = options?.id ?? createSessionId();\n\t\tconst timestamp = new Date().toISOString();\n\t\tconst header: SessionHeader = {\n\t\t\ttype: \"session\",\n\t\t\tversion: CURRENT_SESSION_VERSION,\n\t\t\tid: this.sessionId,\n\t\t\ttimestamp,\n\t\t\tcwd: this.cwd,\n\t\t\tparentSession: options?.parentSession,\n\t\t};\n\t\tthis.fileEntries = [header];\n\t\tthis.byId.clear();\n\t\tthis.labelsById.clear();\n\t\tthis.leafId = null;\n\t\tthis.flushed = false;\n\n\t\tif (this.persist) {\n\t\t\tconst fileTimestamp = timestamp.replace(/[:.]/g, \"-\");\n\t\t\tthis.sessionFile = join(this.getSessionDir(), `${fileTimestamp}_${this.sessionId}.jsonl`);\n\t\t}\n\t\treturn this.sessionFile;\n\t}\n\n\tprivate _buildIndex(): void {\n\t\tthis.byId.clear();\n\t\tthis.labelsById.clear();\n\t\tthis.labelTimestampsById.clear();\n\t\tthis.leafId = null;\n\t\tfor (const entry of this.fileEntries) {\n\t\t\tif (entry.type === \"session\") continue;\n\t\t\tthis.byId.set(entry.id, entry);\n\t\t\tthis.leafId = entry.id;\n\t\t\tif (entry.type === \"label\") {\n\t\t\t\tif (entry.label) {\n\t\t\t\t\tthis.labelsById.set(entry.targetId, entry.label);\n\t\t\t\t\tthis.labelTimestampsById.set(entry.targetId, entry.timestamp);\n\t\t\t\t} else {\n\t\t\t\t\tthis.labelsById.delete(entry.targetId);\n\t\t\t\t\tthis.labelTimestampsById.delete(entry.targetId);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate _rewriteFile(): void {\n\t\tif (!this.persist || !this.sessionFile) return;\n\t\tconst content = `${this.fileEntries.map((e) => JSON.stringify(e)).join(\"\\n\")}\\n`;\n\t\twriteFileSync(this.sessionFile, content);\n\t}\n\n\tisPersisted(): boolean {\n\t\treturn this.persist;\n\t}\n\n\tgetCwd(): string {\n\t\treturn this.cwd;\n\t}\n\n\tgetSessionDir(): string {\n\t\treturn this.sessionDir;\n\t}\n\n\tgetSessionId(): string {\n\t\treturn this.sessionId;\n\t}\n\n\tgetSessionFile(): string | undefined {\n\t\treturn this.sessionFile;\n\t}\n\n\t_persist(entry: SessionEntry): void {\n\t\tif (!this.persist || !this.sessionFile) return;\n\n\t\tconst hasAssistant = this.fileEntries.some((e) => e.type === \"message\" && e.message.role === \"assistant\");\n\t\tif (!hasAssistant) {\n\t\t\t// Mark as not flushed so when assistant arrives, all entries get written\n\t\t\tthis.flushed = false;\n\t\t\treturn;\n\t\t}\n\n\t\tif (!this.flushed) {\n\t\t\tfor (const e of this.fileEntries) {\n\t\t\t\tappendFileSync(this.sessionFile, `${JSON.stringify(e)}\\n`);\n\t\t\t}\n\t\t\tthis.flushed = true;\n\t\t} else {\n\t\t\tappendFileSync(this.sessionFile, `${JSON.stringify(entry)}\\n`);\n\t\t}\n\t}\n\n\tprivate _appendEntry(entry: SessionEntry): void {\n\t\tthis.fileEntries.push(entry);\n\t\tthis.byId.set(entry.id, entry);\n\t\tthis.leafId = entry.id;\n\t\tthis._persist(entry);\n\t}\n\n\t/** Append a message as child of current leaf, then advance leaf. Returns entry id.\n\t * Does not allow writing CompactionSummaryMessage and BranchSummaryMessage directly.\n\t * Reason: we want these to be top-level entries in the session, not message session entries,\n\t * so it is easier to find them.\n\t * These need to be appended via appendCompaction() and appendBranchSummary() methods.\n\t */\n\tappendMessage(message: Message | CustomMessage | BashExecutionMessage): string {\n\t\tconst entry: SessionMessageEntry = {\n\t\t\ttype: \"message\",\n\t\t\tid: generateId(this.byId),\n\t\t\tparentId: this.leafId,\n\t\t\ttimestamp: new Date().toISOString(),\n\t\t\tmessage,\n\t\t};\n\t\tthis._appendEntry(entry);\n\t\treturn entry.id;\n\t}\n\n\t/** Append a thinking level change as child of current leaf, then advance leaf. Returns entry id. */\n\tappendThinkingLevelChange(thinkingLevel: string): string {\n\t\tconst entry: ThinkingLevelChangeEntry = {\n\t\t\ttype: \"thinking_level_change\",\n\t\t\tid: generateId(this.byId),\n\t\t\tparentId: this.leafId,\n\t\t\ttimestamp: new Date().toISOString(),\n\t\t\tthinkingLevel,\n\t\t};\n\t\tthis._appendEntry(entry);\n\t\treturn entry.id;\n\t}\n\n\t/** Append a model change as child of current leaf, then advance leaf. Returns entry id. */\n\tappendModelChange(provider: string, modelId: string): string {\n\t\tconst entry: ModelChangeEntry = {\n\t\t\ttype: \"model_change\",\n\t\t\tid: generateId(this.byId),\n\t\t\tparentId: this.leafId,\n\t\t\ttimestamp: new Date().toISOString(),\n\t\t\tprovider,\n\t\t\tmodelId,\n\t\t};\n\t\tthis._appendEntry(entry);\n\t\treturn entry.id;\n\t}\n\n\t/** Append a compaction summary as child of current leaf, then advance leaf. Returns entry id. */\n\tappendCompaction<T = unknown>(\n\t\tsummary: string,\n\t\tfirstKeptEntryId: string,\n\t\ttokensBefore: number,\n\t\tdetails?: T,\n\t\tfromHook?: boolean,\n\t): string {\n\t\tconst entry: CompactionEntry<T> = {\n\t\t\ttype: \"compaction\",\n\t\t\tid: generateId(this.byId),\n\t\t\tparentId: this.leafId,\n\t\t\ttimestamp: new Date().toISOString(),\n\t\t\tsummary,\n\t\t\tfirstKeptEntryId,\n\t\t\ttokensBefore,\n\t\t\tdetails,\n\t\t\tfromHook,\n\t\t};\n\t\tthis._appendEntry(entry);\n\t\treturn entry.id;\n\t}\n\n\t/** Append a custom entry (for extensions) as child of current leaf, then advance leaf. Returns entry id. */\n\tappendCustomEntry(customType: string, data?: unknown): string {\n\t\tconst entry: CustomEntry = {\n\t\t\ttype: \"custom\",\n\t\t\tcustomType,\n\t\t\tdata,\n\t\t\tid: generateId(this.byId),\n\t\t\tparentId: this.leafId,\n\t\t\ttimestamp: new Date().toISOString(),\n\t\t};\n\t\tthis._appendEntry(entry);\n\t\treturn entry.id;\n\t}\n\n\t/** Append a session info entry (e.g., display name). Returns entry id. */\n\tappendSessionInfo(name: string): string {\n\t\tconst entry: SessionInfoEntry = {\n\t\t\ttype: \"session_info\",\n\t\t\tid: generateId(this.byId),\n\t\t\tparentId: this.leafId,\n\t\t\ttimestamp: new Date().toISOString(),\n\t\t\tname: name.trim(),\n\t\t};\n\t\tthis._appendEntry(entry);\n\t\treturn entry.id;\n\t}\n\n\t/** Get the current session name from the latest session_info entry, if any. */\n\tgetSessionName(): string | undefined {\n\t\t// Walk entries in reverse to find the latest session_info entry.\n\t\t// Empty names explicitly clear the session title.\n\t\tconst entries = this.getEntries();\n\t\tfor (let i = entries.length - 1; i >= 0; i--) {\n\t\t\tconst entry = entries[i];\n\t\t\tif (entry.type === \"session_info\") {\n\t\t\t\treturn entry.name?.trim() || undefined;\n\t\t\t}\n\t\t}\n\t\treturn undefined;\n\t}\n\n\t/**\n\t * Append a custom message entry (for extensions) that participates in LLM context.\n\t * @param customType Extension identifier for filtering on reload\n\t * @param content Message content (string or TextContent/ImageContent array)\n\t * @param display Whether to show in TUI (true = styled display, false = hidden)\n\t * @param details Optional extension-specific metadata (not sent to LLM)\n\t * @returns Entry id\n\t */\n\tappendCustomMessageEntry<T = unknown>(\n\t\tcustomType: string,\n\t\tcontent: string | (TextContent | ImageContent)[],\n\t\tdisplay: boolean,\n\t\tdetails?: T,\n\t): string {\n\t\tconst entry: CustomMessageEntry<T> = {\n\t\t\ttype: \"custom_message\",\n\t\t\tcustomType,\n\t\t\tcontent,\n\t\t\tdisplay,\n\t\t\tdetails,\n\t\t\tid: generateId(this.byId),\n\t\t\tparentId: this.leafId,\n\t\t\ttimestamp: new Date().toISOString(),\n\t\t};\n\t\tthis._appendEntry(entry);\n\t\treturn entry.id;\n\t}\n\n\t// =========================================================================\n\t// Tree Traversal\n\t// =========================================================================\n\n\tgetLeafId(): string | null {\n\t\treturn this.leafId;\n\t}\n\n\tgetLeafEntry(): SessionEntry | undefined {\n\t\treturn this.leafId ? this.byId.get(this.leafId) : undefined;\n\t}\n\n\tgetEntry(id: string): SessionEntry | undefined {\n\t\treturn this.byId.get(id);\n\t}\n\n\t/**\n\t * Get all direct children of an entry.\n\t */\n\tgetChildren(parentId: string): SessionEntry[] {\n\t\tconst children: SessionEntry[] = [];\n\t\tfor (const entry of this.byId.values()) {\n\t\t\tif (entry.parentId === parentId) {\n\t\t\t\tchildren.push(entry);\n\t\t\t}\n\t\t}\n\t\treturn children;\n\t}\n\n\t/**\n\t * Get the label for an entry, if any.\n\t */\n\tgetLabel(id: string): string | undefined {\n\t\treturn this.labelsById.get(id);\n\t}\n\n\t/**\n\t * Set or clear a label on an entry.\n\t * Labels are user-defined markers for bookmarking/navigation.\n\t * Pass undefined or empty string to clear the label.\n\t */\n\tappendLabelChange(targetId: string, label: string | undefined): string {\n\t\tif (!this.byId.has(targetId)) {\n\t\t\tthrow new Error(`Entry ${targetId} not found`);\n\t\t}\n\t\tconst entry: LabelEntry = {\n\t\t\ttype: \"label\",\n\t\t\tid: generateId(this.byId),\n\t\t\tparentId: this.leafId,\n\t\t\ttimestamp: new Date().toISOString(),\n\t\t\ttargetId,\n\t\t\tlabel,\n\t\t};\n\t\tthis._appendEntry(entry);\n\t\tif (label) {\n\t\t\tthis.labelsById.set(targetId, label);\n\t\t\tthis.labelTimestampsById.set(targetId, entry.timestamp);\n\t\t} else {\n\t\t\tthis.labelsById.delete(targetId);\n\t\t\tthis.labelTimestampsById.delete(targetId);\n\t\t}\n\t\treturn entry.id;\n\t}\n\n\t/**\n\t * Walk from entry to root, returning all entries in path order.\n\t * Includes all entry types (messages, compaction, model changes, etc.).\n\t * Use buildSessionContext() to get the resolved messages for the LLM.\n\t */\n\tgetBranch(fromId?: string): SessionEntry[] {\n\t\tconst path: SessionEntry[] = [];\n\t\tconst startId = fromId ?? this.leafId;\n\t\tlet current = startId ? this.byId.get(startId) : undefined;\n\t\twhile (current) {\n\t\t\tpath.unshift(current);\n\t\t\tcurrent = current.parentId ? this.byId.get(current.parentId) : undefined;\n\t\t}\n\t\treturn path;\n\t}\n\n\t/**\n\t * Build the session context (what gets sent to the LLM).\n\t * Uses tree traversal from current leaf.\n\t */\n\tbuildSessionContext(): SessionContext {\n\t\treturn buildSessionContext(this.getEntries(), this.leafId, this.byId);\n\t}\n\n\t/**\n\t * Get session header.\n\t */\n\tgetHeader(): SessionHeader | null {\n\t\tconst h = this.fileEntries.find((e) => e.type === \"session\");\n\t\treturn h ? (h as SessionHeader) : null;\n\t}\n\n\t/**\n\t * Get all session entries (excludes header). Returns a shallow copy.\n\t * The session is append-only: use appendXXX() to add entries, branch() to\n\t * change the leaf pointer. Entries cannot be modified or deleted.\n\t */\n\tgetEntries(): SessionEntry[] {\n\t\treturn this.fileEntries.filter((e): e is SessionEntry => e.type !== \"session\");\n\t}\n\n\t/**\n\t * Get the session as a tree structure. Returns a shallow defensive copy of all entries.\n\t * A well-formed session has exactly one root (first entry with parentId === null).\n\t * Orphaned entries (broken parent chain) are also returned as roots.\n\t */\n\tgetTree(): SessionTreeNode[] {\n\t\tconst entries = this.getEntries();\n\t\tconst nodeMap = new Map<string, SessionTreeNode>();\n\t\tconst roots: SessionTreeNode[] = [];\n\n\t\t// Create nodes with resolved labels\n\t\tfor (const entry of entries) {\n\t\t\tconst label = this.labelsById.get(entry.id);\n\t\t\tconst labelTimestamp = this.labelTimestampsById.get(entry.id);\n\t\t\tnodeMap.set(entry.id, { entry, children: [], label, labelTimestamp });\n\t\t}\n\n\t\t// Build tree\n\t\tfor (const entry of entries) {\n\t\t\tconst node = nodeMap.get(entry.id)!;\n\t\t\tif (entry.parentId === null || entry.parentId === entry.id) {\n\t\t\t\troots.push(node);\n\t\t\t} else {\n\t\t\t\tconst parent = nodeMap.get(entry.parentId);\n\t\t\t\tif (parent) {\n\t\t\t\t\tparent.children.push(node);\n\t\t\t\t} else {\n\t\t\t\t\t// Orphan - treat as root\n\t\t\t\t\troots.push(node);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Sort children by timestamp (oldest first, newest at bottom)\n\t\t// Use iterative approach to avoid stack overflow on deep trees\n\t\tconst stack: SessionTreeNode[] = [...roots];\n\t\twhile (stack.length > 0) {\n\t\t\tconst node = stack.pop()!;\n\t\t\tnode.children.sort((a, b) => new Date(a.entry.timestamp).getTime() - new Date(b.entry.timestamp).getTime());\n\t\t\tstack.push(...node.children);\n\t\t}\n\n\t\treturn roots;\n\t}\n\n\t// =========================================================================\n\t// Branching\n\t// =========================================================================\n\n\t/**\n\t * Start a new branch from an earlier entry.\n\t * Moves the leaf pointer to the specified entry. The next appendXXX() call\n\t * will create a child of that entry, forming a new branch. Existing entries\n\t * are not modified or deleted.\n\t */\n\tbranch(branchFromId: string): void {\n\t\tif (!this.byId.has(branchFromId)) {\n\t\t\tthrow new Error(`Entry ${branchFromId} not found`);\n\t\t}\n\t\tthis.leafId = branchFromId;\n\t}\n\n\t/**\n\t * Reset the leaf pointer to null (before any entries).\n\t * The next appendXXX() call will create a new root entry (parentId = null).\n\t * Use this when navigating to re-edit the first user message.\n\t */\n\tresetLeaf(): void {\n\t\tthis.leafId = null;\n\t}\n\n\t/**\n\t * Start a new branch with a summary of the abandoned path.\n\t * Same as branch(), but also appends a branch_summary entry that captures\n\t * context from the abandoned conversation path.\n\t */\n\tbranchWithSummary(branchFromId: string | null, summary: string, details?: unknown, fromHook?: boolean): string {\n\t\tif (branchFromId !== null && !this.byId.has(branchFromId)) {\n\t\t\tthrow new Error(`Entry ${branchFromId} not found`);\n\t\t}\n\t\tthis.leafId = branchFromId;\n\t\tconst entry: BranchSummaryEntry = {\n\t\t\ttype: \"branch_summary\",\n\t\t\tid: generateId(this.byId),\n\t\t\tparentId: branchFromId,\n\t\t\ttimestamp: new Date().toISOString(),\n\t\t\tfromId: branchFromId ?? \"root\",\n\t\t\tsummary,\n\t\t\tdetails,\n\t\t\tfromHook,\n\t\t};\n\t\tthis._appendEntry(entry);\n\t\treturn entry.id;\n\t}\n\n\t/**\n\t * Create a new session file containing only the path from root to the specified leaf.\n\t * Useful for extracting a single conversation path from a branched session.\n\t * Returns the new session file path, or undefined if not persisting.\n\t */\n\tcreateBranchedSession(leafId: string): string | undefined {\n\t\tconst previousSessionFile = this.sessionFile;\n\t\tconst path = this.getBranch(leafId);\n\t\tif (path.length === 0) {\n\t\t\tthrow new Error(`Entry ${leafId} not found`);\n\t\t}\n\n\t\t// Filter out LabelEntry from path - we'll recreate them from the resolved map\n\t\tconst pathWithoutLabels = path.filter((e) => e.type !== \"label\");\n\n\t\tconst newSessionId = createSessionId();\n\t\tconst timestamp = new Date().toISOString();\n\t\tconst fileTimestamp = timestamp.replace(/[:.]/g, \"-\");\n\t\tconst newSessionFile = join(this.getSessionDir(), `${fileTimestamp}_${newSessionId}.jsonl`);\n\n\t\tconst header: SessionHeader = {\n\t\t\ttype: \"session\",\n\t\t\tversion: CURRENT_SESSION_VERSION,\n\t\t\tid: newSessionId,\n\t\t\ttimestamp,\n\t\t\tcwd: this.cwd,\n\t\t\tparentSession: this.persist ? previousSessionFile : undefined,\n\t\t};\n\n\t\t// Collect labels for entries in the path\n\t\tconst pathEntryIds = new Set(pathWithoutLabels.map((e) => e.id));\n\t\tconst labelsToWrite: Array<{ targetId: string; label: string; timestamp: string }> = [];\n\t\tfor (const [targetId, label] of this.labelsById) {\n\t\t\tif (pathEntryIds.has(targetId)) {\n\t\t\t\tlabelsToWrite.push({ targetId, label, timestamp: this.labelTimestampsById.get(targetId)! });\n\t\t\t}\n\t\t}\n\n\t\tif (this.persist) {\n\t\t\t// Build label entries\n\t\t\tconst lastEntryId = pathWithoutLabels[pathWithoutLabels.length - 1]?.id || null;\n\t\t\tlet parentId = lastEntryId;\n\t\t\tconst labelEntries: LabelEntry[] = [];\n\t\t\tfor (const { targetId, label, timestamp: labelTimestamp } of labelsToWrite) {\n\t\t\t\tconst labelEntry: LabelEntry = {\n\t\t\t\t\ttype: \"label\",\n\t\t\t\t\tid: generateId(new Set(pathEntryIds)),\n\t\t\t\t\tparentId,\n\t\t\t\t\ttimestamp: labelTimestamp,\n\t\t\t\t\ttargetId,\n\t\t\t\t\tlabel,\n\t\t\t\t};\n\t\t\t\tpathEntryIds.add(labelEntry.id);\n\t\t\t\tlabelEntries.push(labelEntry);\n\t\t\t\tparentId = labelEntry.id;\n\t\t\t}\n\n\t\t\tthis.fileEntries = [header, ...pathWithoutLabels, ...labelEntries];\n\t\t\tthis.sessionId = newSessionId;\n\t\t\tthis.sessionFile = newSessionFile;\n\t\t\tthis._buildIndex();\n\n\t\t\t// Only write the file now if it contains an assistant message.\n\t\t\t// Otherwise defer to _persist(), which creates the file on the\n\t\t\t// first assistant response, matching the newSession() contract\n\t\t\t// and avoiding the duplicate-header bug when _persist()'s\n\t\t\t// no-assistant guard later resets flushed to false.\n\t\t\tconst hasAssistant = this.fileEntries.some((e) => e.type === \"message\" && e.message.role === \"assistant\");\n\t\t\tif (hasAssistant) {\n\t\t\t\tthis._rewriteFile();\n\t\t\t\tthis.flushed = true;\n\t\t\t} else {\n\t\t\t\tthis.flushed = false;\n\t\t\t}\n\n\t\t\treturn newSessionFile;\n\t\t}\n\n\t\t// In-memory mode: replace current session with the path + labels\n\t\tconst labelEntries: LabelEntry[] = [];\n\t\tlet parentId = pathWithoutLabels[pathWithoutLabels.length - 1]?.id || null;\n\t\tfor (const { targetId, label, timestamp: labelTimestamp } of labelsToWrite) {\n\t\t\tconst labelEntry: LabelEntry = {\n\t\t\t\ttype: \"label\",\n\t\t\t\tid: generateId(new Set([...pathEntryIds, ...labelEntries.map((e) => e.id)])),\n\t\t\t\tparentId,\n\t\t\t\ttimestamp: labelTimestamp,\n\t\t\t\ttargetId,\n\t\t\t\tlabel,\n\t\t\t};\n\t\t\tlabelEntries.push(labelEntry);\n\t\t\tparentId = labelEntry.id;\n\t\t}\n\t\tthis.fileEntries = [header, ...pathWithoutLabels, ...labelEntries];\n\t\tthis.sessionId = newSessionId;\n\t\tthis._buildIndex();\n\t\treturn undefined;\n\t}\n\n\t/**\n\t * Create a new session.\n\t * @param cwd Working directory (stored in session header)\n\t * @param sessionDir Optional session directory. If omitted, uses default (~/.pi/agent/sessions/<encoded-cwd>/).\n\t */\n\tstatic create(cwd: string, sessionDir?: string): SessionManager {\n\t\tconst dir = sessionDir ?? getDefaultSessionDir(cwd);\n\t\treturn new SessionManager(cwd, dir, undefined, true);\n\t}\n\n\t/**\n\t * Open a specific session file.\n\t * @param path Path to session file\n\t * @param sessionDir Optional session directory for /new or /branch. If omitted, derives from file's parent.\n\t * @param cwdOverride Optional cwd override instead of the session header cwd.\n\t */\n\tstatic open(path: string, sessionDir?: string, cwdOverride?: string): SessionManager {\n\t\t// Extract cwd from session header if possible, otherwise use process.cwd()\n\t\tconst entries = loadEntriesFromFile(path);\n\t\tconst header = entries.find((e) => e.type === \"session\") as SessionHeader | undefined;\n\t\tconst cwd = cwdOverride ?? header?.cwd ?? process.cwd();\n\t\t// If no sessionDir provided, derive from file's parent directory\n\t\tconst dir = sessionDir ?? resolve(path, \"..\");\n\t\treturn new SessionManager(cwd, dir, path, true);\n\t}\n\n\t/**\n\t * Continue the most recent session, or create new if none.\n\t * @param cwd Working directory\n\t * @param sessionDir Optional session directory. If omitted, uses default (~/.pi/agent/sessions/<encoded-cwd>/).\n\t */\n\tstatic continueRecent(cwd: string, sessionDir?: string): SessionManager {\n\t\tconst dir = sessionDir ?? getDefaultSessionDir(cwd);\n\t\tconst mostRecent = findMostRecentSession(dir);\n\t\tif (mostRecent) {\n\t\t\treturn new SessionManager(cwd, dir, mostRecent, true);\n\t\t}\n\t\treturn new SessionManager(cwd, dir, undefined, true);\n\t}\n\n\t/** Create an in-memory session (no file persistence) */\n\tstatic inMemory(cwd: string = process.cwd()): SessionManager {\n\t\treturn new SessionManager(cwd, \"\", undefined, false);\n\t}\n\n\t/**\n\t * Fork a session from another project directory into the current project.\n\t * Creates a new session in the target cwd with the full history from the source session.\n\t * @param sourcePath Path to the source session file\n\t * @param targetCwd Target working directory (where the new session will be stored)\n\t * @param sessionDir Optional session directory. If omitted, uses default for targetCwd.\n\t */\n\tstatic forkFrom(sourcePath: string, targetCwd: string, sessionDir?: string): SessionManager {\n\t\tconst sourceEntries = loadEntriesFromFile(sourcePath);\n\t\tif (sourceEntries.length === 0) {\n\t\t\tthrow new Error(`Cannot fork: source session file is empty or invalid: ${sourcePath}`);\n\t\t}\n\n\t\tconst sourceHeader = sourceEntries.find((e) => e.type === \"session\") as SessionHeader | undefined;\n\t\tif (!sourceHeader) {\n\t\t\tthrow new Error(`Cannot fork: source session has no header: ${sourcePath}`);\n\t\t}\n\n\t\tconst dir = sessionDir ?? getDefaultSessionDir(targetCwd);\n\t\tif (!existsSync(dir)) {\n\t\t\tmkdirSync(dir, { recursive: true });\n\t\t}\n\n\t\t// Create new session file with new ID but forked content\n\t\tconst newSessionId = createSessionId();\n\t\tconst timestamp = new Date().toISOString();\n\t\tconst fileTimestamp = timestamp.replace(/[:.]/g, \"-\");\n\t\tconst newSessionFile = join(dir, `${fileTimestamp}_${newSessionId}.jsonl`);\n\n\t\t// Write new header pointing to source as parent, with updated cwd\n\t\tconst newHeader: SessionHeader = {\n\t\t\ttype: \"session\",\n\t\t\tversion: CURRENT_SESSION_VERSION,\n\t\t\tid: newSessionId,\n\t\t\ttimestamp,\n\t\t\tcwd: targetCwd,\n\t\t\tparentSession: sourcePath,\n\t\t};\n\t\tappendFileSync(newSessionFile, `${JSON.stringify(newHeader)}\\n`);\n\n\t\t// Copy all non-header entries from source\n\t\tfor (const entry of sourceEntries) {\n\t\t\tif (entry.type !== \"session\") {\n\t\t\t\tappendFileSync(newSessionFile, `${JSON.stringify(entry)}\\n`);\n\t\t\t}\n\t\t}\n\n\t\treturn new SessionManager(targetCwd, dir, newSessionFile, true);\n\t}\n\n\t/**\n\t * List all sessions for a directory.\n\t * @param cwd Working directory (used to compute default session directory)\n\t * @param sessionDir Optional session directory. If omitted, uses default (~/.pi/agent/sessions/<encoded-cwd>/).\n\t * @param onProgress Optional callback for progress updates (loaded, total)\n\t */\n\tstatic async list(cwd: string, sessionDir?: string, onProgress?: SessionListProgress): Promise<SessionInfo[]> {\n\t\tconst dir = sessionDir ?? getDefaultSessionDir(cwd);\n\t\tconst sessions = await listSessionsFromDir(dir, onProgress);\n\t\tsessions.sort((a, b) => b.modified.getTime() - a.modified.getTime());\n\t\treturn sessions;\n\t}\n\n\t/**\n\t * List all sessions across all project directories.\n\t * @param onProgress Optional callback for progress updates (loaded, total)\n\t */\n\tstatic async listAll(onProgress?: SessionListProgress): Promise<SessionInfo[]> {\n\t\tconst sessionsDir = getSessionsDir();\n\n\t\ttry {\n\t\t\tif (!existsSync(sessionsDir)) {\n\t\t\t\treturn [];\n\t\t\t}\n\t\t\tconst entries = await readdir(sessionsDir, { withFileTypes: true });\n\t\t\tconst dirs = entries.filter((e) => e.isDirectory()).map((e) => join(sessionsDir, e.name));\n\n\t\t\t// Count total files first for accurate progress\n\t\t\tlet totalFiles = 0;\n\t\t\tconst dirFiles: string[][] = [];\n\t\t\tfor (const dir of dirs) {\n\t\t\t\ttry {\n\t\t\t\t\tconst files = (await readdir(dir)).filter((f) => f.endsWith(\".jsonl\"));\n\t\t\t\t\tdirFiles.push(files.map((f) => join(dir, f)));\n\t\t\t\t\ttotalFiles += files.length;\n\t\t\t\t} catch {\n\t\t\t\t\tdirFiles.push([]);\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Process all files with progress tracking\n\t\t\tlet loaded = 0;\n\t\t\tconst sessions: SessionInfo[] = [];\n\t\t\tconst allFiles = dirFiles.flat();\n\n\t\t\tconst results = await Promise.all(\n\t\t\t\tallFiles.map(async (file) => {\n\t\t\t\t\tconst info = await buildSessionInfo(file);\n\t\t\t\t\tloaded++;\n\t\t\t\t\tonProgress?.(loaded, totalFiles);\n\t\t\t\t\treturn info;\n\t\t\t\t}),\n\t\t\t);\n\n\t\t\tfor (const info of results) {\n\t\t\t\tif (info) {\n\t\t\t\t\tsessions.push(info);\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tsessions.sort((a, b) => b.modified.getTime() - a.modified.getTime());\n\t\t\treturn sessions;\n\t\t} catch {\n\t\t\treturn [];\n\t\t}\n\t}\n}\n"]}