feat(skills): add start-work

A workflow for picking up a specific task (Linear ticket, GitHub issue, todo.org heading, or a described scope) and carrying it through to handoff. Seven phases, three user-approval gates.

The phases in order:
- Claim: mark in-progress, assign, label, verify project.
- Justify (gate 1): benefits, costs, impact, urgency, effort, alternatives, ticket quality.
- Approach (gate 2): root cause, risk, test strategy, migration, flag, commit decomposition, branch name.
- Implement (TDD): red, green, edge cases, and a refactor pass with a nine-point language-agnostic checklist.
- Verify: end-to-end or scripted manual test in the local environment. Playwright for web projects, step-by-step walkthrough for everything else. Never production.
- Ready to commit (gate 3): report, deviations from the approach, any follow-ups spotted.
- Hand off to the Review-and-Publish flow in commits.md.

Cross-referenced from testing.md, commits.md, subagents.md, review-code, brainstorm, arch-design, arch-decide, debug, pairwise-tests, playwright-js, and playwright-py.

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