/**
 * Shared label formatting for the AI-context emitters (CLAUDE.md, AGENTS.md,
 * .github/copilot-instructions.md). ONE acronym-aware Title-Caser so `api_type`
 * renders "API Type" everywhere — not "Api Type" in one file and a raw
 * `api_type` key in another. Unified 2026-06-25 (faf-cli 6.15.1).
 *
 * Labels are registry-first: `slotLabel()` reads the canonical label from the
 * slot registry ("know your stack"); the acronym-aware `titleLabel()` is only a
 * fallback for off-registry freeform keys.
 */
/** All-caps acronym tokens that stay upper-cased inside a Title-Cased label. */
export declare const ACRONYMS: Set<string>;
/**
 * snake_case → Title Case, acronym-aware.
 * `api_type` → "API Type", `mcp_sdk` → "MCP SDK", `runtime` → "Runtime".
 */
export declare function titleLabel(key: string): string;
/** A slot value that carries real content (not empty, not slotignored). */
export declare function filled(v: unknown): v is string;
/**
 * The canonical display label for a .faf slot path, sourced from the slot
 * registry ("know your stack") — `stack.cicd` → "CI/CD", `stack.api_type` → "API".
 * Resolves legacy OR canonical paths (SLOT_BY_PATH is dual-keyed). Falls back to
 * the acronym-aware Title-Caser for off-registry freeform keys.
 */
export declare function slotLabel(path: string): string;