Worktree Controller 1.32.12

• Add repository_lock_admission_version 1. Cooperating readers and writers enter through
  the existing metadata directory before taking repo.lock; an admitted writer prevents
  later readers from continually bypassing it. Nested shared reads in the same thread remain
  safe. Keep repo.lock as the metadata mutation authority and retain CLI 61 / storage 5.
• Keep typed-cleanup history readable even with a queued writer. Mark active cleanup using
  a flock on the existing cleanup-actions directory only after its shared repository lock is
  held. Kernel locks release on process exit; interrupted operations retain their existing
  journal recovery requirements.
  Older runtimes retain exclusion but do not participate in the new admission ordering or marker.
• During one held flock, reuse only the unchanged allocation scope of unrelated completion
  documents. Recheck FD-bound inode/ancestor identities, including ctime, and decode changed
  files again. Relevant receipts, byte hashes, action chains and preservation trees are always
  fully verified. Retain no receipt verdict or scope mapping after the flock ends.
• This prevents a reproduced reader-bypass pattern and reduces repeated unrelated receipt
  decoding; it does not promise strict FIFO, fixed wait times or faster payload verification.

Source commit: 4033e781c3645e002e83a24012fdf0611ab1d6ba.