03cba5b5aa
Remove RELEASE-0.10-PLAN.md and RELEASE-0.10-TASKS.md now that the 0.10.0 milestone work is finished (history preserved in git). Trim ROADMAP.md to open items only; completed work lives in CHANGELOG.md. Version stays 0.10.0 — this release is not yet tagged/shipped. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>