Fix exhausted mobile reseed retries

[arul28]

Follow-up to #875.

Summary

• Re-enable bounded mobile reseeding when an in-flight catchup batch exhausts its ACK retry budget.
• Preserve the peer cursor and existing recovery backoff so the next eligible send is a fresh compact reseed, not incremental replay.
• Add a regression test covering six timed-out sends, the recovery delay, and a new catchup batch from the old cursor.

Validation

• npx vitest run src/services/sync/syncHostService.test.ts
• npx vitest run src/services/sync/syncHostService.test.ts -t "reseed"
• npm run typecheck

Greptile Summary

Re-enables bounded mobile reseeding after exhausted ACK retries.

• Preserves the peer cursor and recovery backoff before launching a fresh compact catchup batch.
• Limits fresh compact reseed launches to one peer per poll.
• Accelerates sparse reseed-cache construction through bounded empty-window scans.
• Refreshes stale oversized caches and adds regression coverage for retry recovery, admission, sparse histories, and cache rebuilding.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failures remain.

T-Rex Logs

What T-Rex did

• Ran the Vitest test for src/services/sync/syncHostService.test.ts with the -t "retries an abandoned far-behind replica reseed" filter, and the run finished with exit code 0, reporting 1 test file passed and 1 selected test passed in 2.65s.

_{Ran code and verified through T-Rex}

Important Files Changed

Filename	Overview
apps/ade-cli/src/services/sync/syncHostService.ts	Restores compact reseed eligibility after catchup abandonment, refreshes stale caches, bounds sparse-cache advancement, and limits fresh launches per poll.
apps/ade-cli/src/services/sync/mobileReplicaReseed.ts	Tracks whether a cache-build step crossed an empty version window so sparse histories can advance in bounded bursts.
apps/ade-cli/src/services/sync/syncHostService.test.ts	Adds coverage for exhausted retry recovery, per-poll reseed admission, sparse version gaps, and rebuilding oversized caches.

Sequence Diagram

sequenceDiagram
participant Phone as Mobile replica
participant Host as Sync host
participant Cache as Reseed cache
Phone->>Host: Connect with stale cursor
Host->>Cache: Build bounded compact reseed
Cache-->>Host: Ready catchup batch
Host->>Phone: Send catchup batch
loop ACK retry budget
Host->>Phone: Retry same batch
end
Host->>Host: Abandon batch and retain old cursor
Host->>Host: Wait for recovery backoff
Host->>Cache: Reuse or rebuild reseed
Host->>Phone: Send fresh catchup batch

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_{Reviews (2): Last reviewed commit: "perf(sync): bound compact reseed work" | Re-trigger Greptile}

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
ade	Ignored	Preview	Jul 22, 2026 11:43pm

[linear-code]

ADE-128

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 929b0c28-b4f4-4857-92fe-15e756e23d99

📥 Commits

Reviewing files that changed from the base of the PR and between fd03f63 and 8afa557.

📒 Files selected for processing (3)

• apps/ade-cli/src/services/sync/mobileReplicaReseed.ts
• apps/ade-cli/src/services/sync/syncHostService.test.ts
• apps/ade-cli/src/services/sync/syncHostService.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ade-128-sync-bound-ios-cr-sqlite-replica-catch-up-with-a-too-far-behind-reseed-post-869

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