fix: disk durability improvements

[choudlet]

Disk Durability Improvements

[github-actions]

Test Results

 60 files  ± 0   60 suites  ±0   1m 8s ⏱️ -2s
486 tests + 6  486 ✅ + 6  0 💤 ±0  0 ❌ ±0 
972 runs  +12  972 ✅ +12  0 💤 ±0  0 ❌ ±0 

Results for commit c83993a. ± Comparison against base commit 943b006.

This pull request removes 3 and adds 9 tests. Note that renamed tests count towards both.

com.metarouter.analytics.storage.EventDiskStoreTest ‑ read returns null for corrupted file and deletes it
com.metarouter.analytics.storage.EventDiskStoreTest ‑ read returns null for unrecognized schema version and deletes file
com.metarouter.analytics.storage.EventDiskStoreTest ‑ read returns null when version field is missing

com.metarouter.analytics.queue.PersistableEventQueueTest ‑ clear wipes pendingOverflow too
com.metarouter.analytics.queue.PersistableEventQueueTest ‑ pendingOverflow preserves events when disk write fails at capacity
com.metarouter.analytics.queue.PersistableEventQueueTest ‑ pendingOverflow retained across repeated failures
com.metarouter.analytics.storage.EventDiskStoreTest ‑ read returns null only when file is absent
com.metarouter.analytics.storage.EventDiskStoreTest ‑ read throws on corrupted file and still deletes it
com.metarouter.analytics.storage.EventDiskStoreTest ‑ read throws on real I-O failure
com.metarouter.analytics.storage.EventDiskStoreTest ‑ read throws on unrecognized schema version and still deletes file
com.metarouter.analytics.storage.EventDiskStoreTest ‑ read throws when version field is missing and still deletes file
com.metarouter.analytics.storage.EventDiskStoreTest ‑ write throws on real I-O failure