chore(claude-md): update for post-flip MyST-as-primary state

The CLAUDE.md scaffolded by /init reflected the pre-MyST repo and was
never updated as the migration landed. Replaces it with a current
description of how the repo actually works:

- MD is the canonical source for migrated pages on all three release
  branches (current/circinus/sagitta) as of 2026-05-06. RST is the
  canonical source for pages that haven't been migrated yet.
- Documents the rare RST override mechanism: rst-<page>.rst plus
  docs/_rst_overrides.txt, scripts/swap_sources.py CLI flags. The
  override list is empty by default; the mechanism is a no-op.
- Editing rules: edit the .md for migrated pages, the .rst for
  non-migrated pages, write new pages as .md from the start. The
  md- prefix used during the migration is gone.

Also adds previously-missing sections: tests command, vale lint
command, branches/versions table with constellation→version mapping,
PR review flow with Copilot+CodeRabbit, worktree convention.

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