kit 5.25.0

Added

• The managed block carries its own bootstrap line. The README one-liner
  tells an agent how to install kit — but kit init replaces it with the
  managed rules block, which said "Start: kit check" and nothing about a
  missing binary. The teammate who cloned a kit-managed repo got the block,
  not the line, and their agent met command not found and had to guess.
  The block now opens with: if kit is missing (fresh clone/machine),
  install it, then continue. The docs↔block drift gate shipped in 5.24.0
  fired on this change exactly as designed and forced the README example to
  follow; kit-public's own CLAUDE.md updated with it (dogfood). Existing
  repos pick the line up on their next kit agent-config / kit init run
  (the block is idempotent — only the marker-delimited region updates).

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Full changelog: https://github.com/sandstream/kit/blob/v5.25.0/CHANGELOG.md

Verify this release:

git tag -v v5.25.0
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