Add --list-categories flag to validator

[Nishieee]

Summary

• Add --list-categories to skill-and-tool-validator so callers can discover valid --skip-categories names without grepping the source
• Print all 11 category constants sorted alphabetically; SOFT categories marked with (advisory)
• Add regression test asserting exact sorted output

Type of change

• Skill change (.claude/skills/<name>/) — eval fixtures updated below
• Tool / bridge contract (tools/<system>/*.md)
• Python package (tools/*/ with pyproject.toml)
• Groovy reference impl
• Cross-cutting (RFC, AGENTS.md, sandbox, privacy-LLM)
• Documentation (docs/, README.md, CONTRIBUTING.md)
• Project template (projects/_template/)
• CI / dev loop (prek, workflows, validators)
• Other:

Test plan

• prek run --all-files passes
• For Python packages touched: uv run pytest / ruff check / mypy passes
• For Groovy bridges touched: command-line invocation tested end-to-end
• For skill changes: eval suite passes for the affected skill
• For skill behaviour changes: a new or updated eval fixture is included in this PR
• Other: uv run --directory tools/skill-and-tool-validator skill-and-tool-validate --list-categories prints sorted categories with advisory markers

RFC-AI-0004 compliance

• HITL
• Sandbox
• Vendor neutrality
• Conversational + correctable
• Write-access discipline
• Privacy LLM

Linked issues

Closes #377

Notes for reviewers (optional)

Discovery flag exits 0 before run_validation(). Includes all 11 named category constants (tool/capability-sync categories plus the skill-validation set).

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds a --list-categories CLI flag to the skill-and-tool-validator that prints every violation category (marking SOFT/advisory ones) and exits, along with a corresponding test.

Changes:

• Introduce ALL_CATEGORIES frozenset enumerating every violation category.
• Add --list-categories argparse flag and handler in main().
• Add test_list_categories test covering the new flag.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
tools/skill-and-tool-validator/src/skill_and_tool_validator/init.py	Defines ALL_CATEGORIES and implements the --list-categories CLI option.
tools/skill-and-tool-validator/tests/test_validator.py	Adds test verifying the listed categories and advisory marking.

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[potiuk]

Can you also fix the prek checks ?