perf: reuse logging locks and cache source paths - #416
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…wned-handlers-and-forc' into enhancement/381-20261003-perf-lifecycle-logging-costs-107-us-record-about-20x-stdlib
…wned-handlers-and-forc' into enhancement/381-20261003-perf-lifecycle-logging-costs-107-us-record-about-20x-stdlib
…wned-handlers-and-forc' into enhancement/381-20261003-perf-lifecycle-logging-costs-107-us-record-about-20x-stdlib
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Persistent logging now reuses its private sidecar descriptor and caches human-log source paths per invocation. Repeated source paths avoid filesystem resolution, forked children reopen their lock descriptor, and sidecar failures use logging's error handler so commands can complete.
Validation: 605 tests and 254 subtests; strict framework and consumer typing; regression coverage for descriptor reuse, cleanup, repeated paths, and logging failures. Throughput budgets and calibration follow in #391.
Train: follows the logger ownership fix. Fixes #381.