Planning GitHub Issue Tasks

Plan a GitHub issue snapshot into docs/<ISSUE_SLUG>-tasks.md. This is the Phase 2 orchestrator for the GitHub planning workflow: it routes stages, dispatches specialists, preserves stage artifacts for resume and critique, and returns a concise handoff.

The orchestrator keeps only workflow state, subagent verdicts, paths, counts, and user decisions in context. Detailed contracts, templates, validation checks, and source-backed background are loaded just in time from bundled references or optional external URLs.

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