- Add `ankiConnect.knownWords.maturityEnabled`/`matureThresholdDays` config resolution with validation, warnings, and fallback to defaults
- Session help color legend shows one row per maturity tier (new/learning/young/mature) when maturity coloring is on, instead of a single known-words swatch
- Update docs and changelog entry to describe the new legend behavior
- Replace `renderGroupedChanges` with `polishFragmentsWithClaude` that pipes fragments through `claude -p --model sonnet` to merge related items, drop housekeeping noise, and produce user-facing release notes
- Internal fragments kept in CHANGELOG.md under a `<details>` collapse; dropped from GitHub release notes entirely
- CI no longer auto-runs `changelog:build` on tag-based releases — fails fast with a clear error if `changes/*.md` fragments are still pending; build locally and commit before tagging
- Add `runClaude` dep-injection seam to test surface; add failure-mode coverage (missing binary, empty output, missing headers, missing `<details>` wrapper)
- Delete implemented design doc; update `changes/README.md` and `docs/RELEASING.md` with claude CLI prerequisite and new workflow
sudacode
