fix(threads): a merged PR settles its thread only once - #7454

💭 Looking at the diff, the main Effect-related change is in GitManager.ts and the git contracts file, while most other changes are React client code unrelated to Effect services. I want to check the GitManager.ts import conventions specifically. The GitManager change follows existing conventions with namespace imports and Option.match. I should verify that PullRequestInfo actually has an updatedAt field typed as Option, and double-check the schema addition in contracts git.ts looks fine. I'm confirming this diff doesn't create, move, or refactor any Effect service, so there are no convention violations to flag—this should be "All clear." I need to reconcile that verdict with the requirement to output valid JSON per the schema rather than just the literal text.