test: preserve iOS ASR failure phase diagnostics

[leehack]

Scope

Closes #488.

Recover useful preserved iPad diagnostic work on current main. Qwen3-ASR failures now carry content-free setup/transcript/cancellation/microphone/reload/teardown phase evidence and validated short SHA-256 identifiers. Shared row recording preserves other-row behavior; cleanup cannot replace the primary failure or phase. Invalid setup metadata is omitted rather than logged. The original dirty worktree is untouched.

Runtime behavior, acceptance assertions, microphone requirements, dependency pins, release policy, and public APIs are unchanged. No model or physical-device run is claimed.

Current-main refresh

Normal merge commit da8ac9b integrates base 3d9e377 after recovery #491 completed exact-main CI successfully. No rebase or force push. The PR diff remains exactly three harness/test files.

Validation

• Actual local macOS Flutter 3.47.1 support test execution: PASS, all 123 physical_ios_speech_e2e_support_test.dart cases. The previous Apple hook blocker is fixed on main; no bypass is used.
• Dart 3.13.1 touched-file analyzer and canonical format: PASS. git diff --check: PASS.
• Behavioral regressions cover every phase, invalid digests, nested cleanup, preserved failure identity, row mismatch, and unchanged other-row results; static wiring complements behavior tests.
• Fresh independent Astra exact-head QA at da8ac9b against 3d9e377: PASS, no blocking findings. Reviewed actual phase/cleanup/recording call sites and bounded privacy serialization. No further worthwhile cleanup or optimization identified.
• Current-head hosted CI: 13/13 populated checks SUCCESS, including Linux coverage/aggregate, native macOS/Windows, Chrome, docs/lint, Web Chat Contract real worker/GGUF smoke, companions, parity, advisory and preview. CI run: https://github.com/leehack/llamadart/actions/runs/34232011375 . Hosted macOS also passed the explicit fresh/warm/add/remove Flutter cache-transition integration.
• Final refresh: CLEAN/MERGEABLE, clean local/remote exact head, 0 behind / 2 ahead; zero unresolved review threads. Technically ready, deliberately remains draft pending maintainer decision.
• Current GraphQL review threads: 0 total / 0 unresolved. No automated approving review is claimed.

Boundaries

No mark-ready, merge, publication, workflow dispatch, pin change, or physical device action. No known PR-caused P1 regression. This remains draft for maintainer consideration. The original dirty iPad worktree and preserved local changes are untouched.

[github-actions]

Chat app preview removed for leehack/llamadart-chat-pr-489.