feat(mobile): v1.8 tab switcher + branch indicator + git_status tool

Mobile header is now two rows. Row 1: hamburger | project · branch
indicator (live via GET /api/projects/:id/git, 30s poll) | ModelPicker |
FolderTree. Row 2: pane-switcher pill (hand-rolled BottomSheet) +
NewPaneMenu. Chat-within-pane navigation hidden on mobile; users switch
panes via the sheet. Cross-tab status sync via chat_status frames
published from inference.ts at working/idle/error transitions; StatusDot
component renders amber-pulse/green/red/gray on each pane row and on
desktop ChatTabBar tabs. Level 1 git awareness exposes a read-only
git_status tool to the model, backed by services/git_meta.ts (execFile
+ 2s timeout + 30s cache). Workspace.tsx now receives panes/chats hooks
as props (hoisted into Session.tsx) so the header pill shares state
with the pane grid.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/server/src/services/tools.ts

@@ -3,6 +3,7 @@ import { resolve, basename, relative } from 'node:path';
 import { z } from 'zod';
 import { pathGuard, PathScopeError } from './path_guard.js';
 import { grep as fileOpsGrep, findFiles as fileOpsFindFiles } from './file_ops.js';
+import { getGitMeta } from './git_meta.js';
 
 const MAX_FILE_BYTES = 5 * 1024 * 1024;
 const DEFAULT_VIEW_LINES = 200;
@@ -266,11 +267,45 @@ export const findFiles: ToolDef<FindFilesInputT> = {
   },
 };
 
+// v1.8 Level 1 branch awareness: gives the model a read-only view of the
+// project's git state. No path input — operates on the inference-resolved
+// project root via getGitMeta. Subprocess runs with a 2s timeout (see git_meta).
+const GitStatusInput = z.object({}).strict();
+type GitStatusInputT = z.infer<typeof GitStatusInput>;
+
+export const gitStatus: ToolDef<GitStatusInputT> = {
+  name: 'git_status',
+  description:
+    "Returns the current git branch, whether the working tree is dirty, and ahead/behind counts vs upstream. Read-only. Use when you need to know which branch the user is currently working on.",
+  inputSchema: GitStatusInput,
+  jsonSchema: {
+    type: 'function',
+    function: {
+      name: 'git_status',
+      description:
+        'Returns the current git branch, dirty flag, and ahead/behind counts vs upstream. Read-only.',
+      parameters: {
+        type: 'object',
+        properties: {},
+        additionalProperties: false,
+      },
+    },
+  },
+  async execute(_input, projectRoot) {
+    const meta = await getGitMeta(projectRoot);
+    if (meta === null) {
+      return { repo: false, branch: null, is_dirty: false, ahead: 0, behind: 0 };
+    }
+    return { repo: true, ...meta };
+  },
+};
+
 export const ALL_TOOLS: ReadonlyArray<ToolDef<unknown>> = [
   viewFile as ToolDef<unknown>,
   listDir as ToolDef<unknown>,
   grep as ToolDef<unknown>,
   findFiles as ToolDef<unknown>,
+  gitStatus as ToolDef<unknown>,
 ];
 
 export const TOOLS_BY_NAME: Record<string, ToolDef<unknown>> = Object.fromEntries(