Harden skill catalog route rejection guidance

[kriptoburak]

Summary

• Reject proof-gated public skill catalogs that require maintainer evidence before promotion.
• Reject registry CLI repos whose author flow only discovers topic-tagged source repositories.
• Reject product-specific skill packs that require platform access.

Validation

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

Note

Harden skill catalog route rejection guidance with new rejection phrases

Adds three new rejection clauses to SUBMISSION_READINESS.md: curated public skill catalogs requiring maintainer proof or promotion evidence, registry CLIs whose author flow only discovers topic-tagged repositories, and product-specific skill packs requiring platform access. The same three phrases are appended to the agent_runtime.txt fixture so tests recognize them as valid rejection phrases.

^{Macroscope summarized 25c8741.}