chore: mark TODO johannesjo#12 complete (selectMcpJsonDir test added)

Author: brooksc

TODOS.md

@@ -9,16 +9,6 @@
 
 ---
 
-## Missing unit tests
-
-### 12. selectMcpJsonDir — Docker mode writes .mcp.json to worktree
-
-**File:** `electron/ipc/register.ts` (`selectMcpJsonDir`), `electron/ipc/register.test.ts`
-**What's missing:** The `selectMcpJsonDir(worktreePath, projectRoot)` helper has no test.
-**Done when:** Tests in `register.test.ts` assert: (a) `worktreePath` set → returns `worktreePath`; (b) `worktreePath` undefined → returns `projectRoot`. Both cases with and without `dockerContainerName` set.
-
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-
 ## Beta blockers — lifecycle/scoping issues
 
 ### 13. Coordinator cross-contamination — tasks not scoped to their coordinator