- Add v0.26 CHANGELOG entry (10 post-Sprint-23 fixes) - Remove SPRINT_23_PLAN.md (planning artifact, not runtime docs) - Bump version label to v0.26 in index.html - Update SPRINTS header and footer to v0.26 / 426 tests - Update CHANGELOG footer to v0.26 / 426 tests Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>