Test Codex plugin skill contracts

[ScriptedAlchemy]

Summary

• add Rust skill contract tests (tests/plugin_skill_contract_test.rs) that mirror Codex skill-creator quick_validate rules for bundled Codex skills
• add Cursor-specific skill frontmatter linting so Cursor-only fields like paths and disable-model-invocation stay valid without being forced into the Codex schema
• assert the generated/installed Codex and Cursor plugin skill trees are byte-identical copies of the source skill folders (hermetic against ambient TRACEDECAY_DATA_DIR)
• add a canonical, CRLF-tolerant SKILL.md frontmatter parser (src/automation/skill_frontmatter.rs) shared by the contract tests and the Hermes skill inventory, replacing bespoke per-site parsing
• remove Codex-only paths frontmatter from running-impacted-tests and narrow the documented divergence in src/agents/codex.rs to frontmatter only, so the skill bodies must still mirror byte-for-byte
• rewrite 14 cursor-plugin slash-skill descriptions to lead with "Use to …" trigger language so their metadata follows skill-creator trigger guidance, enforced by a documented trigger-language rule

Tests

• python3 /home/zack/.codex/skills/.system/skill-creator/scripts/quick_validate.py <each codex-plugin/skills/*>
• cargo test --test plugin_skill_contract_test
• cargo test codex_skills_match_the_cursor_source_for_parity
• cargo test session_context_skill_index_matches_bundle_skills
• cargo test --test update_plugin_test
• cargo test -p tracedecay --lib -- automation::skill_frontmatter automation::hermes_skill_inventory
• cargo fmt --all --check && cargo clippy -p tracedecay --lib --test plugin_skill_contract_test --test update_plugin_test -- -D warnings

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[chatgpt-codex-connector]

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[ScriptedAlchemy]

Addressed in bc2129f: running-impacted-tests is now explicitly listed in CODEX_SKILL_FRONTMATTER_DIVERGENCES with a justification comment, and the parity test still compares its body line-for-line after stripping frontmatter, so body drift remains caught. codex_skills_match_the_cursor_source_for_parity passes on the branch.