test(storage): cover records, vault, PINs, lockout and migrations

34 new tests (65 per device): round trips per entry type, every tampered
byte, swapped records, the pending queue, the entry cap, a full store at
67 fill levels, the lockout schedule on a fake clock including restarts,
erase, PIN change and reset, auto-lock wiping, and v0 to v1 migration.
Adds an in-memory store with a size limit and storage benchmarks.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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