Improve repository discoverability

[kadu9]

Summary

Verification

• ruff check .
• pytest
• Tested a real git repository or added focused tests for the changed behavior.

Security and Privacy

• No secrets, private source code, local absolute paths, or personal machine details are included.
• Generated .owndiff/ artifacts are not committed.
• User-controlled repository content is treated as untrusted input.

OwnDiff Gate

• For risky code changes, .owndiff/ownership-gate.json allows the push/MR action.
• Not applicable because this change is docs, tests, config, or low-risk maintenance.