test(server): remove duplicate missing worktree test - #8252

💭 The diff just removes a test verifying that removing an already-gone worktree is a no-op, which is a coverage deletion rather than an obvious convention violation. I want to check the file and driver to see if that behavior is still tested elsewhere before flagging anything.

1. git_tools — Path.Path|makeTmpDir|removeWorktree — rejected: repo.url: required parameter is missing or empty;repo: required parameter is missing or empty

2. git_tools — add029a — rejected: repo.url: required parameter is missing or empty;repo: required parameter is missing or empty

3. git_tools — Path|makeTmpDir|removeWorktree

💭 The removed test checked that calling removeWorktree on a path that was never registered is a no-op, but there's a separate test at line 748 expecting an error for a "notAWorktree" path — I'm checking whether these two expectations actually conflict, and whether the remaining idempotency and stale-worktree tests still cover the behavior adequately.

4. browse_code — apps/server/src/vcs/GitVcsDriverCore.test.ts

5. browse_code — apps/server/src/vcs/GitVcsDriverCore.test.ts

💭 That removed test scenario is already covered elsewhere, so there's no real convention violation—everything looks clear. Given the schema requires structured output even when there are no findings, I'll represent this as a success state with "All clear" as the title and summary.