Complete REUSE-WP-0004: CI, overlap detection, and catalog generation

Add Gitea CI workflow for registry validation, reuse-surface overlaps and
catalog commands, generated catalog artifacts, and documentation updates
closing gap analysis priorities 9-11.

workplans/REUSE-WP-0004-registry-hardening.md

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+---
+id: REUSE-WP-0004
+type: workplan
+title: "Registry hardening: CI, overlap detection, and catalog"
+domain: helix_forge
+repo: reuse-surface
+status: finished
+owner: codex
+topic_slug: helix-forge
+created: "2026-06-15"
+updated: "2026-06-15"
+---
+
+# Registry hardening: CI, overlap detection, and catalog
+
+Follow-up to `docs/IntentScopeGapAnalysis.md` section 8 next recommended work
+(priorities 9–11). Raise registry quality through automated CI validation, overlap
+reporting (UC-RS-015), and a generated human-readable catalog (UC-RS-018).
+
+## Add CI Validation Workflow
+
+```task
+id: REUSE-WP-0004-T01
+status: done
+priority: high
+```
+
+Add `.gitea/workflows/ci.yml` that runs on push and pull requests to `main`.
+Install the package and run `reuse-surface validate`. Document the workflow in
+`AGENTS.md`.
+
+## Add Overlap Detection Command
+
+```task
+id: REUSE-WP-0004-T02
+status: done
+priority: high
+```
+
+Add `reuse-surface overlaps` that flags potential duplicate or overlapping
+capabilities using summary/tags/includes similarity and relation signals.
+Document usage in `registry/README.md` and `tools/README.md`.
+
+## Add Catalog Generation Command
+
+```task
+id: REUSE-WP-0004-T03
+status: done
+priority: medium
+```
+
+Add `reuse-surface catalog` that generates `docs/CapabilityCatalog.md` and
+`docs/catalog/index.html` from the index and entry front matter. Group by domain
+and show maturity vectors.
+
+## Refresh Docs And Gap Analysis
+
+```task
+id: REUSE-WP-0004-T04
+status: done
+priority: medium
+```
+
+Update `SCOPE.md`, `tools/README.md`, and `docs/IntentScopeGapAnalysis.md` to
+reflect CI, overlaps, and catalog capabilities. Close gap analysis priorities
+9–11.