docs: delegate PGN/transcript curation to Claude coworker agent

[jamestyhurst]

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Summary

• Documents the architectural decision to outsource all content curation (finding PGNs, fetching commentary transcripts) to a separate Claude coworker agent rather than hard-coding discovery logic into Greco
• Greco stays purely reactive — it processes whatever files are in its watched directories; the agent handles the logistics
• Backlog item docs: add session handoffs location and skill installations #3 (bulk commentary transcripts) marked as delegated to the coworker agent

Changes

• ROADMAP.md — added a dedicated "Coworker agent" section describing the interface (two drop folders: sample-games/ for PGNs, commentary_refs/<name>/transcript.txt for transcripts); updated backlog item docs: add session handoffs location and skill installations #3 status
• ARCHITECTURE.md — added a "Coworker agent (external)" section explaining the filesystem interface and the separation of concerns
• README.md — updated the Roadmap blurb and added a callout linking to the coworker agent section

Test plan

• Read ROADMAP.md and confirm the coworker agent section is clear and the backlog table reflects the delegation
• Read ARCHITECTURE.md and confirm the new section fits logically between the pipeline description and the launchers section
• Read README.md and confirm the Roadmap blurb is accurate and the coworker agent callout is concise

https://claude.ai/code/session_01E1DudRs9BJLFc8LTC311sA
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