Advertise agent skill discovery keyword

[kriptoburak]

Summary

• add agent-skill to packaged project keywords and skill.json registry keywords
• add a metadata guard that keeps package, source-registry, README, and GitHub-topic guidance aligned for topic-based registries

Discovery

• completed full open-PR audit at /tmp/hermes-tweet-open-prs-20260621-1524.json and /tmp/hermes-tweet-pr-audit-20260621-1524.jsonl with 427 PRs, 0 errors, and no capped shards
• ran Xquik crawler first with fresh agent connector and integration directory queries; /tmp/hermes-tweet-20260621-1524-agent-connectors-crawl.json parsed successfully and returned 0 opportunities
• inspected direct skill/plugin/catalog candidates; live candidates were duplicates, non-native, personal/source-owned, topic-only publish flows, or domain-specific bundles

Validation

• uv run --python 3.12 --extra dev pytest tests/test_metadata.py
• uv run --python 3.12 --extra dev python scripts/check_public_safety.py
• uv run --python 3.12 --extra dev pytest tests/test_public_safety.py
• uv run --python 3.12 --extra dev ruff format --check
• uv run --python 3.12 --extra dev ruff check
• uv run --python 3.12 --extra dev pip-audit
• git diff --check

Note

Add "agent-skill" keyword to project metadata and skill manifest

Adds "agent-skill" to the keywords in pyproject.toml and skill.json to support topic-based agent skill discovery. A new test in tests/test_metadata.py validates that the keyword is present in both files and referenced in the docs and README.

^{Macroscope summarized 9e13079.}