[leehack]

Summary

• Tests only, from #1861 (0.19.3 plan #1874, lane 6). Classified high-risk only by path (readiness policy and structured-output test files); no production code changes.
• high_risk_readiness_test.dart: N2 (a PR that removes a generated header and edits a comment is rejected, both revision orders), N3/N3b (every Dart file the pin tooling reads is in rawTextConsumedSources: the DEFAULT_* Dart paths in tool/native/sync_native_release_pins.py, which include hook/build.dart and litert_lm_runtime.dart, plus nativeLlamaCppTagPath and the bridge-tag pin paths), N4 (a comment edit must end its line in both revisions).
• public_parse_unopened_thought_test.dart: M11, ChatTemplateEngine.parse ends a Hermes / DeepSeek V3 / Qwen3-Coder thought at </think> before any <think>.
• The lib/llama_cpp_bindings.dart Dartdoc reword was dropped: it is not comment-only at base and would need a separate PR with a recorded maintainer waiver.

Production-readiness scope

• User-facing scope: None.
• Supported platforms/paths: VM tests.
• Unsupported or intentionally unavailable paths: N/A
• Out of scope / follow-ups: #1861.

Completeness checklist

• Declared scope is fully implemented, or explicitly reduced above.
• Regression coverage covers the original issue.
• Security/privacy review completed: none needed.

PR type guidance

• Docs-only PR: N/A (tests only; no runtime behavior changes).

Test Plan

• dart run tool/prepare_workspace.dart
• dart format --output=none --set-exit-if-changed .
• dart analyze
• high_risk_readiness_test.dart, public_parse_unopened_thought_test.dart, test/unit/core/template, test/unit/test_structure, VM, isolated TMPDIR
• coverage-lib N/A: no lib/ behavior change

Matrix Evidence

Matrix row	Scope covered	Platform / model / backend	Result	Evidence / notes
N/A	tests only	macOS VM	pass	mutants below

Mutants killed: N2 (read only head comments), N3 (drop each of hook/build.dart, litert_lm_runtime.dart, web_bridge_setup.dart, native_release_pins.dart from the set), N4 (check only the head gap; only the base gap), M11 (parse passes promptOpensNoThought: true).

Review Notes

• Independent review status: pending (high-risk by path; needs an independent auditor before ready)
• CI status / head SHA: 691a2a3

High-risk regression review

• Classification: high-risk (surfaces: backendRuntime, regressionPolicy, structuredOutput; all by path, tests only)
• Implementation task: this lane (l193-sweep)
• Independent blocking QA task: pending
• Exact head / current base: 691a2a3 / f78cafa
• Production-branch deletion, bypass, or miswire proof: N/A (no production code)
• Local evaluator check: a draft v2 evidence file (tests-only change, cited compiled-grammar test) run through tool/testing/high_risk_readiness.dart exits 2 (unverifiedPrerequisites); the independent auditor builds the real one.
• Affected-family real-model/artifact evidence: N/A (no production code)
• Explicit unavailable-family or other N/A evidence: N/A
• Known PR-caused P1 regressions: 0
• Unresolved review threads: 0

Refs #1861, Refs #1874

[leehack]

Landed on main via batch integration PR #1895 (rebase merge, main ba4e0e1b; tree identical to the audited integration head 5ffd1224).

[github-actions]

Chat app preview removed for leehack/llamadart-chat-pr-1878.