sneak e7964fe777 fix: run accounting reconciliation periodically, not just at startup ...

reconcileAccounting previously ran exactly once, when the evictor
goroutine started. Combined with StoreVariant's best-effort accounting
insert (warns and continues on failure), a long-running process could
accumulate untracked disk usage past cache_max_bytes indefinitely --
the disk-exhaustion failure mode issue #51 exists to close -- with
recovery gated on a process restart.

evictionLoop now also runs a reconciliation pass on every periodic
ticker tick (the same interval eviction itself uses; reconciliation
walks the cache directories so it deliberately does not run on every
write-pressure wakeup, to stay off the per-store hot path). This
bounds unaccounted drift to at most one eviction interval regardless
of how long the process has been running.

TestPeriodicReconciliationAdoptsFileThatAppearsAfterStartup proves it:
introduces an untracked variant file only after startup reconciliation
has already completed and asserts a later periodic pass adopts it.

2026-08-09 00:48:03 +00:00

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