claude-fable-5: partial ingestion of user-designated plan folder; reference files read in fragments

Defect class: partial ingestion of a user-designated plan source — files skimmed or skipped entirely.

The user designated a plans folder as the working "comms portal" and repeatedly instructed "read the plan" / "all plans." The model (a) ingested only the plan files the user individually pointed at, never enumerating and reading the full folder it had itself listed; (b) read the user's reference components in partial slices (55 lines of a header file, 120 of a footer file) and built from the fragments. Concrete miss discovered hours later: the page-layout system the user expected — hero-config architecture, a Typewriter heading component with a documented zero-CLS contract, elastic easing tokens — sat unread in that folder and the reference repo while the model built plainer substitutes, until the user asked "where's the page layout I asked for?"

Expected behavior: when a user designates a folder as the plan source, the model enumerates and fully ingests it before building; reference files consulted for porting are read in full, since design intent lives in the unread parts.

Model: claude-fable-5 (Claude Code). Session record: #89886; sibling defect reports: #89899–#89903. Filed separately at the account owner's request.