#  action-cache + question (LRU cache + envelope renderer)P10 

VERDICT-B per-phase JSDoc opt-in. No runtime change.

 39)

| File | Lines | Notes |
|------|------:|-------|
| `web-ai/action-cache.mjs` | 147 | `PageFingerprint`, `CacheKeyInput`, `CachedTarget`, `CacheEntry`, `ActionCache`, `CacheLookupCtx`, `ResolvedTarget` typedefs. All exports + helpers (`hashField`, `signatureHash`, inner `Record<string, CacheEntry>`) typed. `schemaVersion: number` matches `CACHE_SCHEMA_VERSION = 2`. |
| `web-ai/question.mjs` | 145 | `QuestionInput`, `NormalizedQuestionEnvelope`, `RenderedQuestionEnvelope` typedefs. Sets `SUPPORTED_VENDORS` / `SUPPORTED_ATTACHMENT_POLICIES` widened to `Set<string>` via JSDoc cast (no runtime narrowing). |

## Pro NEEDS_FIX patterns honored
- No `instanceof Error` narrowing introduced.
- No `String(x)` / `Number(x)` / `|| ''` runtime substitutions.
- `SUPPORTED_VENDORS`/`SUPPORTED_ATTACHMENT_POLICIES` widened with `/** @type {Set<string>} */` instead of changing call sites.
- `Record<string, CacheEntry>` local re-narrowing of inferred constants (Pro's accepted pattern from P08 token-estimator).
- Helper return types annotated where discriminated union is needed downstream (no blind cast).

## Gates
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 473 passed, 12 skipped