feat(claude): Plan Creator Skill

[vprashrex]

Issue

Closes #1209

Summary

• Before: No skill for turning an agreed SRD/spec into an implementation plan.
• Now: Added a plan-creator skill (.claude/skills/plan-creator/SKILL.md) that generates implementation plans grounded in docs/wiki and the domain-map blast-radius procedure — the step between "spec agreed" and "start coding".

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
• If you've fixed a bug or added code that is tested and has test cases.

Notes

Docs/tooling-only change (Claude skill file) — no application code touched.

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[github-actions]

OpenAPI changes   ⚪ No API surface changes

Note

This PR does not modify the API contract.

_{main ↔ f43db785 · generated by oasdiff}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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