Crash harness

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Harness expectations

• Randomly ingest frames, call commit() at varied intervals
• Kill the process mid-commit to leave partial WAL writes
• Restart, let Memvid::open() replay the WAL, and assert:
  • frame_count matches expectations
  • timeline() returns ordered timestamps (verifies Time Index Track persisted)
  • Checksums match (header, TOC, time index)

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Sample assertion

use std::num::NonZeroU64;
use memvid_core::{Memvid, TimelineQuery};

let mut mv = Memvid::open(path).unwrap();
let stats = mv.stats().unwrap();
assert_eq!(stats.frame_count, expected_frames);
let timeline = mv
    .timeline(
        TimelineQuery::builder()
            .limit(NonZeroU64::new(100).unwrap())
            .build(),
    )
    .unwrap();
assert!(timeline.windows(2).all(|w| w[0].timestamp <= w[1].timestamp));

Performance target - open_and_recover_latency must stay below 250 ms, even when replaying WAL entries (Security & Performance Architecture).