Implement scrub scheduler + dedup repair: Phase 5-6 complete
Phase 5: Background scrub scheduler (~220 lines)
- ScrubScheduler: periodic scrub at configurable interval
- ScrubSchedulerConfig: interval_secs, scrub_on_startup, repair_enabled
- start/stop/run_once methods
- ScrubStats: running, scrub_count, last/next scrub time
- 6 unit tests: default config, start/stop, stats, timestamp format
Phase 6: Dedup repair integration (~30 lines)
- DedupStore::get_block_by_checksum(): retrieve by SHA-256 hash
- DedupStore::has_block_by_checksum(): check existence
- DedupStore::repair_from_checksum(): repair corrupted block
- checksum::repair_block_from_dedup(): integration hook
Tests: 471 passed (+6 new scrub_scheduler tests)
Files:
- markbase-core/src/vfs/scrub_scheduler.rs (NEW)
- markbase-core/src/vfs/dedup.rs (MOD +30 lines)
- markbase-core/src/vfs/checksum.rs (MOD +20 lines)
- markbase-core/src/vfs/mod.rs (MOD +1 line)
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