Tighten registry route rejections

[kriptoburak]

Summary

• reject README-only placeholder registries, zip-only skill wrappers, and source-owned generated catalogs in submission readiness
• add fixture phrases so route-saturation coverage catches those dead-end discovery paths

Validation

• uv run --python 3.12 --extra dev pytest tests/test_submission_readiness.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
• git diff --check

Note

Add rejection phrases for placeholder and generated registries to route rejection criteria

Adds three new disallowed categories — 'README-only placeholder registries', 'zip-only skill wrapper repos', and 'source-owned generated catalogs' — to both the SUBMISSION_READINESS.md rejection guidelines and the agent_runtime.txt test fixtures.

^{Macroscope summarized 3fdef32.}

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