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.

tools/README.md

@@ -42,6 +42,25 @@ reuse-surface export
 reuse-surface export --format json
 ```
 
+### overlaps
+
+Detect potential duplicate or overlapping capabilities (UC-RS-015).
+
+```bash
+reuse-surface overlaps
+reuse-surface overlaps --threshold 0.35
+```
+
+### catalog
+
+Generate human-readable catalog artifacts (UC-RS-018).
+
+```bash
+reuse-surface catalog
+```
+
+Writes `docs/CapabilityCatalog.md` and `docs/catalog/index.html`.
+
 ## Export format
 
 The export bundle includes:
@@ -59,6 +78,8 @@ Stable IDs and maturity fields are preserved for agent consumption (UC-RS-019).
 | Discover capabilities | `reuse-surface query` or read the index |
 | Validate entry shape | `reuse-surface validate` |
 | Export for agents | `reuse-surface export --format json` |
+| Detect overlap | `reuse-surface overlaps` |
+| Publish catalog | `reuse-surface catalog` |
 
 ## Related use cases