perf(server): cache default branch name and origin existence across status refreshes - #5008

💭 I'm reviewing the PR changes to check for any convention issues—specifically looking at how imports are structured (Cache, Exit, Duration from subpaths) and verifying the TestClock import in the test file, since the cache keying issue appears to be resolved with the gitCommonDir and normalizeRepositoryPathsCacheKey updates, and test coverage has been added. Now looking at the main file's imports and the new code being added. I'm noticing that the cache lookup functions are acquiring path from the environment with const path = yield* Path.Path, which shadows an outer path variable that's already being used elsewhere. It's a valid dependency injection pattern, but it creates some redundancy and affects the cache's type signature since Cache.makeWith now requires the Path dependency. Let me verify whether these are actual Effect-service-convention violations. The prior checks flagged the cache key and missing test, both of which I've addressed. Now I need to examine the statusDetails region around lines 1570-1660 to see if there are any convention issues there—checking things like error handling with Effect.orElseSucceed and Effect.catchTags. I'm checking whether the cache invalidation logic is correct — since initRepo creates a new repository with a different gitCommonDir key, the prior status cache entries wouldn't apply anyway since they'd be keyed under the old repository paths. Now I need to verify whether the Effect service is being used according to its conventions, starting with how the Path service is being accessed. Looking at the test more carefully, I see it uses TestClock.adjust to advance time, which should work fine since the cache TTLs are based on the Clock service. But I need to check whether ensureRemote is properly wrapped with the invalidation logic and whether the statusDetailsLocal path actually exists in the driver. There's also a behavioral shift worth noting: the old code called symbolic-ref directly in the working directory, while the new caching approach uses --git-dir with the fetch directory derived from a basename check. For worktrees, gitCommonDir points to the main repo's .git, so using it for symbolic-ref is sound since refs/remotes are shared across worktrees. The change is reasonable, but I should verify that the mutation methods are properly wrapped and that ensureRemote goes through the invalidation wrapper. I'm noticing the test setup issue with makeTmpDir requiring a Scope, and the new tests aren't wrapping in Effect.scoped like the existing test does. I need to figure out whether it.effect from @effect/vitest provides a Scope automatically—I think it.scoped is the right choice for scoped effects in Effect v3, but v4 might handle this differently with it.effect. Let me look at how other tests in the repo handle this. I should check whether the other tests in those describe blocks are using Effect.gen directly or if they're also using Effect.scoped. I'm realizing that it.effect in this repo's Effect v4 setup already provides a Scope automatically, so using makeTmpDir without Effect.scoped should work fine — though other tests might wrap things in Effect.scoped for more explicit control over finalization order. Now I'm wondering whether it.effect also provides TestClock by default in this particular setup. Looking at the test imports, it's pulling TestClock from "effect/testing/TestClock" and calling adjust on it, which should work. But there's a timing consideration: the code uses Effect.timeout with Duration for subprocess commands, and with TestClock those timeouts won't fire in real time — that's actually fine. The cache TTLs matter too — repositoryPathsCache has a 10-minute TTL, and when TestClock.adjust advances time by 6 minutes, entries expire correctly and get re-looked-up. The second test should be valid since Effect v4's Cache respects timeToLive and expires entries after the adjusted time passes. I'm now checking the actual Effect service conventions in the new code to see if there are any issues, starting with whether there's a duplicate yield* Path.Path inside the cache. The regression test confirms that without invalidation, stale data would be returned after ensureRemote. The TTL expiry test is solid. I'm checking whether invalidateStatusStaticCaches uses the right cache key — it derives from resolveRepositoryPaths(cwd), same as statusDetails, so that's consistent. The fallback key when null is a dead branch since statusDetails skips the cache entirely in that case. For linked worktrees, passing --git-dir gitCommonDir to the remote command works fine since config is shared, though there's a behavioral difference in how the symbolic ref is resolved compared to the previous implementation. statusDetails now runs resolveRepositoryPaths before the Effect.all, which adds a serialized step but isn't a convention violation. I'm noticing that path gets acquired twice — once at the top level in makeGitVcsDriverCore and again inside the lookup via yield* Path.Path — which is redundant but harmless. The Cache lookup's environment requirements propagate correctly in Effect, so everything compiles fine since Path is available in the constructor's environment. No service-convention violations found, and the prior concerns are addressed. The final response should indicate success, though there's a tension between the instruction to respond with "All clear" and the JSON schema requirement. Let me verify that the helper functions like parseDefaultBranchFromRemoteHeadRef and resolveDefaultBranchName are actually defined and available for the fallback logic, and confirm the imports haven't been inadvertently modified. All clear.