Review found three ways the takeover could let two writers overlap.
- A claimant that read an exited PID could remove the lock of a new
holder that reused that PID before the claim. The claimant now probes
the PID again under the claim, after re-reading the record.
- The browser Worker's process shim reports its own PID as absent, so a
second writer in the Worker took over the first one's live lock. A
record naming the contender's own process is never taken over.
- Takeover proves only that the holder exited, while a pnpm run it
started can still be writing the profile. Each profile operation now
records its pnpm run in .plugin-manager/run.json and removes the record
when the run ends; an operation that finds a record waits for the run
within the existing tree bound and otherwise refuses, naming the
process and the record, without running pnpm.
A failed removal of the exited holder's lock now waits instead of
failing the acquisition, the probe range is stated as int32, and the
tests inject exited PIDs instead of reusing real ones, which Windows
reissues at once.
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