[leehack]

Summary

• verify_release_docs_versions.dart fails when a retained release's bullets differ between CHANGELOG.md and website/docs/changelog/recent-releases.md, apart from the prescribed WebGPU bridge wording (Prepare 0.19.7 release #1951 audit).
• Pin that a ChatFormat index past the end takes the generic handler, not contentOnly (Close the 0.19.7 test gaps from #1938 #1948 audit, mutant N4).
• Test that the genkit_llamadart llamadart floor in pubspec.yaml matches the version prose in genkit-package.md, README, migration, tool-input-schemas and ci.yml (genkit_llamadart: resolve the thinking budget through core (#1929) #1952 audit, mutant T6).
• Wording only: rewrap the long doc/testing_matrix.md line, cite pub-dev's inline 128 * 1024 pubspec limit, and mention WebGPU thinkingBudget in the GenerationParams.thinkingBudget Dartdoc (Check pubspec size and genkit in the release verifier; test LiteRT remover guards (#1935) #1947, Close the 0.19.7 test gaps from #1938 #1948, Keep the response-format grammar applied through a budgeted forced-open thought #1956 audits).

Tracks #1950; does not close it. Companion standard-risk PR: #1960

Production-readiness scope

• User-facing scope: Release-prep and CI gating; a Dartdoc sentence. No runtime behavior change.
• Supported platforms/paths: Maintainer tooling, PR CI, release prep.
• Unsupported or intentionally unavailable paths: N/A
• Out of scope / follow-ups: Linux pidfd re-measure, real-model LiteRT-LM e2e skip, Streaming partial parses differ from the final parse by chunking (MiniMax M3, thinking tags, Gemma 4) #1930 stay open in 0.19.8 audit follow-ups #1950. The lazy-grammar-pause test is dropped: its mutant F is equivalent today.

Completeness checklist

• Declared scope is fully implemented, or explicitly reduced above.
• Unsupported platform/option combinations fail loudly. (N/A, no runtime change)
• Docs updated: release-workflow.md describes the new gate; no changelog entry (nothing user-observable).
• Regression coverage covers the original issue plus negative paths.
• Validation coverage registry: N/A, no capability change.
• Security/privacy review: nothing touched.
• Follow-ups tracked in 0.19.8 audit follow-ups #1950.

PR type guidance

• Docs-only PR: N/A, tooling and tests included; no runtime behavior changes. Docs built with ./tool/docs/build_site.sh.

Mutation check

Mutant	Test	Result
D1 never report drift	docs_changelog_drift_test.dart	killed
D2 no bridge-article normalization	same	killed
D3 compare Unreleased	same	killed
D4 flag a section only one file has	same	killed (after adding a docs-only case)
D5 ignore the whole bridge line	same	killed
N4 past-the-end fallback generic to contentOnly	thinking_budget_resolution_test.dart	killed
T6 stale floor in genkit-package.md	genkit_doc_floor_test.dart	killed
D1 (audit) stale floor in genkit README	same	killed

Test Plan

• dart run tool/prepare_workspace.dart
• dart format --output=none --set-exit-if-changed .
• dart analyze
• dart test -p vm -j 1 --exclude-tags local-only N/A locally: ran test/unit/tooling/ (1744 pass) and the thinking-budget test; full lane in CI
• dart test -p chrome --exclude-tags local-only N/A, no web paths
• coverage-lib N/A, Dartdoc-only lib/ change
• Other: verify_release_docs_versions.dart passes on this tree; ./tool/docs/build_site.sh

Matrix Evidence

Matrix row	Scope covered	Platform / model / backend	Result	Evidence / notes
high-risk tier	gate, tests, wording	macOS, no model	N/A	surfaces are tooling/doc-only; no affected model family; independent audit pending

Review Notes

• Independent review status: PASS (fresh auditor-deep at db4c73a, P2 fixed; delta re-audit at 1d4dd75 PASS, 18/18 mutants killed)
• CI status / head SHA: green (33 pass, 8 skipped) / 1d4dd75

High-risk regression review

• Classification: high-risk (backendRuntime, regressionPolicy, releaseAutomation, structuredOutput; all from tests, tooling, comments and a Dartdoc)
• Implementation task: this lane (Sonnet worker)
• Independent blocking QA task: fresh auditor-deep delta re-audit, PASS, 0 P1/P2; simulated 0.19.8 release prep (faithful - and * bridge bullets pass; tag, version, order and wording drift fail); P3s in 0.19.8 audit follow-ups #1950
• Exact head / current base: 1d4dd759dc95c2fd54fb900a758127a66bbdc7fa / ec62e97c (main 3f6ccd3e adds only Pin the lazy-grammar pause and the Seed-OSS call-name constraint in tests #1963 tests; merge-tree clean, merge preview passes); evaluator exit 2
• Production-branch deletion, bypass, or miswire proof: N/A, no production code changes
• Affected-family real-model/artifact evidence: N/A, no runtime change
• Explicit unavailable-family or other N/A evidence: N/A
• Known PR-caused P1 regressions: 0
• Unresolved review threads: 0

[github-actions]

Chat app preview removed for leehack/llamadart-chat-pr-1961.