feat(sync): auto-register as replica with origin after successful mirror

[kevincodex1]

The sync worker mirrored repos from peers but never told the origin, so replica_count (repo_replicas table, GET /api/v1/repos/:owner/:repo/replicas) stayed at 0 network-wide — the dashboard showed 0 replication even for repos that were actually mirrored.

After each successful clone/fetch the worker now sends a signed PUT /api/v1/repos/{owner}/{repo}/replicas to the origin with our public_url, using the same HTTP-Signature scheme as push notifies. Best-effort by design: skipped when public_url is unset, failures are logged without failing the sync, and the PUT is idempotent on the origin (201 first, 200 after) so re-registering every sync is self-healing.

Nodes need this build before their mirrors are counted: a new node's repos show replication once its peers upgrade.

Summary by CodeRabbit

• New Features
  • Nodes now automatically register as replicas with sync origins after successfully mirroring repositories, enhancing distributed synchronization capabilities

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e8409af4-0f80-450e-afa7-0b4297795631

📥 Commits

Reviewing files that changed from the base of the PR and between 7a8b6c4 and eb2a939.

📒 Files selected for processing (2)

• crates/gitlawb-node/src/main.rs
• crates/gitlawb-node/src/sync.rs

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📝 Walkthrough

Walkthrough

The sync worker gains post-mirror replica registration. node_keypair is threaded from main through sync::start → run → process_batch. After each successful mirror and mark_sync_done, the worker calls a new best-effort helper that signs a PUT request to the origin's /replicas endpoint with the node's public URL.

Changes

Replica Registration After Sync

Layer / File(s)	Summary
Keypair threading from main through sync worker crates/gitlawb-node/src/main.rs, crates/gitlawb-node/src/sync.rs	sync::start gains an Arc<Keypair> parameter; main.rs passes Arc::clone(&state.node_keypair); run and process_batch are updated to forward the reference.
Replica registration helpers and call site crates/gitlawb-node/src/sync.rs	After mark_sync_done, process_batch calls register_replica_with_origin (best-effort, result ignored). New helpers build the /replicas path, skip when public_url is absent or empty, sign the PUT with http_sig::sign_request, send digest and signature headers, and log outcomes. Module docs and unit tests cover the route format and the skip-on-no-URL cases.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐇 A key in my paw, I hop to the source,
Signing my PUTs with a confident force.
"I hold your replica!" I tell the origin node,
A best-effort whisper along the sync road.
No failure shall stop me, I log and move on —
The replica count grows from dusk until dawn! 🌿

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: automatic replica registration with the origin repository after successful synchronization. It directly aligns with the primary objective of the PR.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch auto-replica-registration

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