style(skills): apply ruff format and wire skills/ into workspace checks

[Arnxvvv]

Summary

• Adopts skills/ as a workspace member (skills/pyproject.toml added and declared in root [tool.uv.workspace] members), bringing helper scripts and guards under standard CI linting, type-checking, and testing.
• Applies ruff format across all Python code under skills/, reflowing long set literals, regex constants, and multiline argument lists to comply with the 110-character line-length standard without altering runtime logic.
• Removes temporary skip: deleted the [tool.magpie.checks] skip = ["ruff-format"] block so that run-workspace-check.sh and pre-commit hooks run the formatter check automatically across skills/.

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

• For Python packages touched: uv run pytest / ruff check / mypy passes:
  • uv run --directory skills --project . ruff format --check . (9 files verified formatted)
  • uv run --directory skills --project . ruff check . (all lint rules passed clean)
  • uv run --directory skills --project . python -m mypy . (clean type-check across 9 source files)
  • uv run --directory skills --project . python -m pytest (9 passed in 0.14s)
• uv lock --check passes with magpie-skills v0.1.0 member resolved.

RFC-AI-0004 compliance

• HITL — any new mutation is gated on explicit user confirmation
• Sandbox — no new unrestricted host access; network reach declared in the adapter
• Vendor neutrality — placeholders (<PROJECT>, <tracker>, <upstream>, <security-list>) used in all skill / tool prose (the check-placeholders prek hook is the mechanical gate)
• Conversational + correctable — agentic-override path documented if behaviour is adopter-tunable
• Write-access discipline — no autonomous outbound messages; drafts only, sent on confirmation
• Privacy LLM — private content does not reach a non-approved LLM; redactor invoked where needed

Linked issues

• Closes ci(skills): remove the ruff-format skip once the formatting churn lands #1076
• Follow-up to ci(skills): lint, type-check and test the Python under skills/ #1054

Notes for reviewers (optional)

• Includes the foundational infrastructure from PR ci(skills): lint, type-check and test the Python under skills/ #1054 (skills/pyproject.toml, workspace member registration, uv.lock update, and type annotations in scan_ci_runners.py / collect_status.py) along with the mechanical ruff format changes so the branch is completely self-contained and ready for immediate CI testing.