release: prepare FigOps 0.20.2 candidate

CHANGELOG.md

@@ -15,10 +15,21 @@ This project uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html) and
   changed-file `uv run ruff check ...`, and `uv run python figops_mcp_server.py --smoke`.
 - Maintainers tag releases after merge; implementers open PRs but do not merge or tag.
 
-## [0.20.2] - 2026-07-29
+## [0.20.2] - 2026-08-03
 
-Post-0.20.1 release-candidate metadata entry. This records the next patch
-candidate only; merge, tag, and package publication remain maintainer actions.
+Patch release candidate covering the post-0.20.1 integrity and release-boundary
+hardening work. Merge, tag, and package publication remain maintainer actions.
+
+### Changed
+
+- Add exact line-center contact evidence to geometry diagnostics so diagonal
+  bbox artifacts can be distinguished from real artist collisions without
+  changing the legacy overlap projection.
+- Clarify the raw geometry contract, legacy compatibility fields, and policy
+  boundary in the diagnostic specification and QA rubric.
+- Restore the split-marker release boundary for the project-derived internal
+  style target and keep the public release status generated from the current
+  technical gate.
 
 ## [0.20.1] - 2026-07-25