feat: checkpoint provider sync rechecks

[seonghobae]

Outcome

• persist a path-free, SHA-256-bound checkpoint for each third-party provider global-sync observation
• wait for the documented five-minute boundary before another automatic probe while evidence is blocked or inconclusive
• preserve monotonic observation lineage and reject provider/time drift
• stop automatic polling after a complete clear queue while requiring a separate fresh item-specific check before any local eviction

Live read-only evidence

• existing DiskSage provider/eviction records: 3; provider-sync-confirmed: 0; eviction-ready: 0; confirmed bytes: 0
• iCloud global state remains needs-sync-up
• OneDrive temporary storage: 17,671,028 KiB; only Sync Service and updater roles were observed
• Google Drive runtime is active; the retained bounded audit has no meaningful candidates

No source file, provider object, provider process, or provider-internal storage was mutated.

Validation

• cargo test --locked --manifest-path src-tauri/Cargo.toml provider_global_sync::tests --lib (21 passed)
• git diff --check
• Cargo target cleaned after validation (1.8 GiB)

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[devin-ai-integration]

Devin Review found 1 new potential issue.