project-sync: read merged/closed delta MRs from the index, not at list weight

[m4ttheweric]

the project-sync delta fetched every state at list weight, so GitLab evaluated approval rules for merged MRs too. on a ~1,000-file merged deploy MR that alone runs past the 60s request limit, one page 500s, the whole cycle fails, freshness never advances, and the board goes stale for hours (8h today, until this was found).

What changed

• fetchDeltaFrom (new, exported): opened MRs still come from fetchPullRequests at list weight; merged/closed come from glance's fetchMergeRequestIndex
• index rows only move entries the store already holds (state, updatedAt, mergedAt, title); everything else on the entry is kept
• an MR in both responses keeps only the terminal copy (applyDelta skips a second copy of an iid it just wrote)
• the pipeline top-up refreshes a terminal copy the delta just built, since it carries its open-era pipeline (gitq's stack board renders it)
• a never-stored terminal MR is fetched in full only when it would become its branch's findBySourceBranch answer (newest per branch, and only if the scope filter would keep its author); others are dropped
• the default fetchDelta delegates to it through a new deltaContext seam; the fetchDelta seam's contract is unchanged

Verification

• 13 new tests in project-sync.test.ts, including one driving syncProjectMRs through the default fetchDelta; file is 104/104, tsc --noEmit clean
• CodeRabbit was rate limited on the later commits, so two Opus reviews covered them; their findings are fixed here
• ran fetchDeltaFrom against the live stuck window (store read-only): 118 opened MRs in ~14s, no 500s. the old all-states query 500s on page 3 at 60.4s
• full bun run test: 8690 pass, 13 fail, all in rt-tray/Tests/stub-rt/stub.test.ts from bun missing on the local spawn PATH (the known mise-shim issue), unrelated

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Previously unstored, completed merge requests are now included in sync when they are the newest eligible request for a branch and no open request exists there.
  • Sync now refreshes stored merge requests when they become completed, including requests with pipelines still in progress.
  • Duplicate merge requests returned during sync are handled without creating duplicate entries.

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📝 Walkthrough

Walkthrough

fetchDeltaFrom now selects eligible terminal merge requests that are not stored and fetches the newest candidate per branch. The default delta fetch supports an override for its provider and project path. Pipeline top-up can refresh an in-flight pipeline for a merge request that moved to a terminal state.

Changes

Merge request delta fetching

Layer / File(s)	Summary
Select and fetch terminal deltas lib/daemon/project-sync.ts, lib/daemon/__tests__/project-sync.test.ts	fetchDeltaFrom selects terminal index entries when the branch has a stored merge request, no open entry exists, and the candidate is not older than the newest stored IID. It applies the stored author-scope check, fetches the highest-IID eligible candidate per branch, skips failed full fetches, and removes duplicate IIDs from opened results. Tests cover filtering, overlapping responses, and terminal state updates.
Wire delta context and refresh terminal pipelines lib/daemon/project-sync.ts, lib/daemon/__tests__/project-sync.test.ts	The default delta fetch can obtain its provider and project path through deltaContext; the production fallback uses getRepoContext. Pipeline top-up can check in-flight pipelines for a delta-changed merge request that moved to a terminal state. Tests cover default wiring and pipeline refresh.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 1873b

Project sync now fetches opened merge requests separately from merged and closed ones. It also pulls in the newest relevant closed or merged merge request for each tracked branch and refreshes in-flight pipelines for merge requests that just finished. The earlier problem, where a merge request could stay marked open after closing, has been addressed. No outstanding issues remain, and the change appears ready to merge.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 14.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the primary change: project-sync now reads merged and closed delta MRs from the index instead of fetching them through the list endpoint.
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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Inline comments:
In `@lib/daemon/project-sync.ts`:
- Line 182: Update fetchDeltaFrom to remove opened entries whose IID also
appears in terminal, so the terminal copy is retained before applying the delta.
Add a regression test verifying the stored state is terminal when an IID appears
in both responses.

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[m4ttheweric]

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