Recording flow no longer uploads inline. AudioRecorder writes the m4a
straight into filesDir/recordings/unsynced/{caseId}_{utc}.m4a; the VM
follows up with an atomic sidecar (.meta.json) holding case_id + recorded_at.
Sync trigger is a SyncTrigger seam (no-op for now, fleshed out in Phase 4)
so the screen pops back to the case detail immediately after the queue
write — uploads happen out-of-band.
PendingStore mirrors doctate-client-core::upload (sidecar shape, atomic
tmp+rename, scan FIFO sorted by recorded_at, deletePair idempotent).
Audio file naming uses recorded_at_to_filename_stem semantics — colons
swapped for dashes — so paths round-trip with the desktop client and
filesystems that disallow colons.
8 new PendingStoreTest cases (atomic write, FIFO order, orphan skip,
unreadable sidecar resilience, idempotent delete). 43 tests green total.
Brummel
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