[leehack]

Summary

• Prepare genkit_llamadart 3.9.0: pubspec.yaml version 3.8.0 -> 3.9.0 and CHANGELOG.md ## Unreleased -> ## 3.9.0 - 2026-11-12. Only these two files change.
• Minor bump because the llamadart floor moved to ^0.19.7 (as in 3.6.0, 3.7.0 and 3.8.0). Core and companion numbering are untouched.
• Maintainer approved preparing it on 2026-11-12 ("Prepare 3.9.0 now"). Do not merge without the maintainer's separate go: merging tags and publishes to pub.dev.

Production-readiness scope

• User-facing scope: Release of the Genkit adapter with the structured-output thinking budget resolved through core's ChatTemplateEngine.resolveThinkingBudget (genkit_llamadart: thinking budget forces a bare </think> on Qwen3-Coder XML templates #1929).
• Supported platforms/paths: Same as the adapter's existing support; no code change here.
• Unsupported or intentionally unavailable paths: N/A, no behavior change in this PR.
• Out of scope / follow-ups: None.

Completeness checklist

• Declared scope is fully implemented, or explicitly reduced above.
• Unsupported platform/option combinations: N/A, version/changelog only.
• Changelog entry dated; other docs N/A (no API change).
• Regression coverage: N/A, covered by genkit_llamadart: resolve the thinking budget through core (#1929) #1952; adapter suite rerun.
• Validation coverage registry: N/A, no capability change.
• Security/privacy review: nothing leaks; metadata-only change.
• Follow-up work: None.

PR type guidance

• Docs-only PR: N/A. Release-prep PR: manifest version and changelog only, no runtime change.

Test Plan

• dart run tool/prepare_workspace.dart N/A, no root change
• dart format --output=none --set-exit-if-changed . N/A at root; run in packages/genkit_llamadart: pass
• dart analyze N/A at root; dart analyze --fatal-infos in the package: pass
• dart test -p vm -j 1 --exclude-tags local-only N/A, root untouched
• dart test -p chrome --exclude-tags local-only N/A, root untouched
• coverage-lib N/A, no lib/ change
• Genkit lane from packages/genkit_llamadart: dart pub get, dart format, dart analyze --fatal-infos, python3 .github/check_docs.py, dart test -x real-model (474 passed), staged pub publish --dry-run (0 warnings), verify_release_docs_versions.dart (pass)

Matrix Evidence

Matrix row	Scope covered	Platform / model / backend	Result	Evidence / notes
genkit adapter lane	format, analyze, docs, tests, staged publish dry-run	macOS, Dart/Flutter 3.47.1	Pass	See Test Plan
other rows	N/A	N/A	N/A	Manifest/changelog only

Review Notes

• Independent review status: deep audit PASS at e41113f7. A workflow-gate replay passed, with 8 negative controls failing as they should.
• CI status / head SHA: green (Genkit local core, Genkit lower bounds and published with pana 160/160, Markdown Tests), e41113f

High-risk regression review

• Classification: high-risk (classifier: artifactConsumer, from the manifest path packages/genkit_llamadart/pubspec.yaml). Content is version and changelog only; kept as draft until an independent audit.
• Implementation task: this PR's author lane
• Independent blocking QA task: a fresh auditor-deep session (not the author) passed it, with zero PR-caused P1s and zero unresolved threads. Evidence: llamadart-evidence/pr-1955/ (evaluator exit 2).
• Exact head / current base: e41113f / 9aa0837
• Production-branch deletion, bypass, or miswire proof: N/A, no production code change; two-file rule checked locally (diff touches exactly packages/genkit_llamadart/CHANGELOG.md and pubspec.yaml, both modified)
• Affected-family real-model/artifact evidence: N/A, no runtime change; staged archive dry-run passed
• 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-1955.