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.

SCOPE.md

@@ -50,7 +50,9 @@ and agents can:
   `external_evidence.reliability`
 - **Validate entries automatically** with `reuse-surface validate`
 - **Export a machine-readable bundle** with `reuse-surface export`
-- **Avoid duplicates** by querying the index before creating new entries
+- **Detect overlap candidates** with `reuse-surface overlaps`
+- **Generate a human-readable catalog** with `reuse-surface catalog`
+- **Avoid duplicates** by querying the index and checking overlaps before adding entries
 
 Registry tooling availability is **A3** (CLI). The registry product itself is
 still documentation-first for authoring; consumption combines Markdown entries,
@@ -58,11 +60,10 @@ the index, and CLI automation.
 
 ## What Is Not Possible Yet
 
-- Generated human-readable catalog site
+- Interactive catalog site with live search beyond static HTML export
 - Capability graph visualization
-- Automated duplicate/overlap detection
 - Federation across repositories or organizations
-- CI integration or packaged releases beyond local `pip install -e .`
+- Packaged releases beyond local `pip install -e .` and Gitea CI validation
 
 See `tools/README.md` for command reference.
 
@@ -74,7 +75,9 @@ See `tools/README.md` for command reference.
   `pyproject.toml` and `reuse_surface/`.
 - `docs/CapabilityRegistryConcept.md` and `docs/IntentScopeGapAnalysis.md`
   document onboarding and intent-scope tracking.
-- Finished workplans: `REUSE-WP-0001`, `REUSE-WP-0002`, `REUSE-WP-0003`.
+- CI validates the registry on push/PR via `.gitea/workflows/ci.yml`.
+- Generated catalog: `docs/CapabilityCatalog.md` and `docs/catalog/index.html`.
+- Finished workplans: `REUSE-WP-0001` through `REUSE-WP-0004`.
 - **Self-assessed vector:** `D5 / A3 / C4 / R2` (see gap analysis).
 
 ## Repository Layout
@@ -105,6 +108,7 @@ reuse-surface/
 - Maturity standard: specs/CapabilityMaturityStandard.md
 - Registry index: registry/indexes/capabilities.yaml
 - Registry guidance: registry/README.md
+- Generated catalog: docs/CapabilityCatalog.md
 - CLI reference: tools/README.md
 - Agent instructions: AGENTS.md
 - Workplans: workplans/