Doc 20 D0 second deliverable (doc 21 §4). tests/kicad/quasimodal-strand.spec.ts
reproduces the Symbol Properties hang on demand, in two parts:
- "staging" (GREEN): double-click the fixture symbol → Symbol Properties
opens → arm the parking timer (wasm/bindings/timer_park.h) WHILE the
dialog is up. Because the opener's fiber park is open-ended, a timer
firing now necessarily parks on top of it — the overlap is structural,
not a won race. Asserts the dialog opened, the timer fired, its OK
button is hittable, and the shim beaconed concurrent contexts. Keeps
the red pin from rotting into vacuity, and fails loudly on its own.
- "doc-19 red" (test.fail()): clicks OK and asserts the desired end state
— dialog closes, zero fiber-resume-refused beacons, wait books balanced
(no unresolved nested/modal wait). Goes green at D3, when Playwright
will report "expected to fail but passed" and the marker comes off.
Verified 6/6 consecutive full-file runs, identical outcome each time:
closed=false dialogs=1 refused-resumes=1 — the doc-19 mechanism exactly
(quarantined fiber's legitimate resume refused, dialog never closes).
Deliberately NOT asserted in staging: the timer park COMPLETING (whether
a park survives the aliasing is the disease under test) and sawParked (a
100ms sampler can miss a short park) — both are reported, not gated.
Retires tests/kicad/dialog-deadlock-probe.spec.ts: the 8/4 throwaway probe
that established the mechanism. This spec supersedes it and, unlike it, is
deterministic (the probe's 3 blind waitForTimeouts were the only
determinism-lint violations in the tree; the guard is now clean).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TEHGiiXMShNXbBr7gSJ7iz
