Plans up to date; plan 004 brief for agility-rooms - #49

This updates the plans to match what has merged and adds the brief the agility-rooms session will start from.

• Plan 001: A6 now describes what shipped: npmjs, Linux and Windows CI, and trusted publishing behind the npm environment. The rooms track (Track D) drops prerequisites that are already met (A1, A2), uses the 7 November survey counts, and names attachments (A7) and rooms' IHttpClient test seam. Its checklist line links the new brief.
• Plans 002 and 003: both are marked done, with their PRs. Their dependency sections now describe pinning the published package instead of a git commit.
• Plan 004 (new): the agility-rooms brief. It covers:
  • a summary of the survey and what the SDK already offers rooms;
  • the decision to make first: rooms' rest-1 writes and its Copy operation;
  • steps R1 and D1–D4, the v1sdktesting-only rules, and when it's done.

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