feat: Complete 9 tasks

- ✅ **Change 1** — `src/main/git.ts`: Add `LOCK_FILES`, `buildTaskSubject`, `getStagedFileNames`, `buildFileSubject` helpers; rewrite `commitMsg` block in `autoCommitTurn`
- ✅ **Change 2a** — `src/main/ipc/handlers.ts`: Update import to include `ensureGitIgnore`; strip branch creation from `sessions:create`; add bare `ensureGitIgnore` call
- ✅ **Change 2b** — `src/main/ipc/handlers.ts`: Update `workflow:advance` to create branch on implement transition; return `{ phase, git_branch }`
- ✅ **Change 3** — `src/main/preload.ts`: Update `advancePhase` return type in `ClaudeFlowAPI` interface
- ✅ **Change 4** — `renderer/src/App.tsx`: Destructure `{ phase, git_branch }` from advance result; spread `git_branch` into `setSelectedSession`
- ✅ **Change 5a** — `renderer/src/components/Header.tsx`: Remove branch from `<option>` text
- ✅ **Change 5b** — `renderer/src/components/Header.tsx`: Add `phase !== "implement"` guard to rename button
- ✅ **Change 5c** — `renderer/src/components/Header.tsx`: Gate badge on `gitBranch` truthy; remove disabled/unavailable state
- ✅ **Change 6** — `renderer/src/styles/globals.css`: Delete `.branch-badge.branch-unavailable` rule

1 files changed, 0 insertions, 6 deletions

diff --git a/renderer/src/styles/globals.css b/renderer/src/styles/globals.css
index 9d37742..ef0275e 100644
--- a/renderer/src/styles/globals.css
+++ b/renderer/src/styles/globals.css
@@ -206,12 +206,6 @@ html[data-theme="light"] .session-rename-input {
   color: white;
 }
 
-.branch-badge.branch-unavailable {
-  border-style: dashed;
-  opacity: 0.5;
-  cursor: default;
-}
-
 /* ── Main Content ─────────────────────────────────────────────── */
 .main-content {
   flex: 1;