Every TaskStore.init() now records a `store:open` run-audit event with
pid/ppid/execPath/entry/cwd/node version. Motivated by the FN-7910 incident:
a stale pre-fix binary opened the shared fusion.db and evacuated Ideas cards,
and the audit trail (agentId:"system", no PID) could not identify the writer.
Any future mystery mutation is now attributable to the process that opened
the store.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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