feat: complete reorganize-long-files cleanup

- Extract tool instance lifecycle endpoints (start/stop/restart/delete) from
  api/tool/tool_instances.py into new api/tool/tool_lifecycle.py.
- Register tool_lifecycle_router in main.py and api/tool/__init__.py.
- Extract inline WorkspaceDetailPage components into
  components/features/workspace/: detail header, tab bars, file/git/tools/settings
  panels. Slim page from ~446 to ~62 lines.
- Update OpenSpec reorganize-long-files tasks to reflect completed work and
  current source state; mark change completed.
- Regenerate project maps.

Quality gates: python3 -m py_compile (backend clean), npm run typecheck,
npm run lint, npm test -- --run (87 passed), pytest workspace integration
and unit tests (27 passed, 1 skipped).

apps/web/src/components/features/workspace/workspace-git-panel.tsx

@@ -0,0 +1,41 @@
+/** Git tab for the workspace detail page. */
+
+import { useWorkspaceGit } from "../../../hooks/use-workspace-git";
+
+interface WorkspaceGitPanelProps {
+	workspaceId: string;
+}
+
+export function WorkspaceGitPanel({ workspaceId }: WorkspaceGitPanelProps) {
+	const { history, branches, currentBranch, checkout, loading, error } =
+		useWorkspaceGit(workspaceId);
+
+	return (
+		<div className="git-tab">
+			<div className="git-tab-header">
+				<select
+					value={currentBranch}
+					onChange={(e) => checkout(e.target.value)}
+				>
+					{branches.map((b) => (
+						<option key={b} value={b}>
+							{b}
+						</option>
+					))}
+				</select>
+			</div>
+			{loading && <p className="muted">Loading history...</p>}
+			{error && <p className="error-text">{error}</p>}
+			<div className="commit-history">
+				{history.map((commit) => (
+					<div key={commit.hash} className="commit-row">
+						<span className="commit-hash">{commit.hash.slice(0, 7)}</span>
+						<span className="commit-message">{commit.message}</span>
+						<span className="commit-author">{commit.author}</span>
+						<span className="commit-date">{commit.date}</span>
+					</div>
+				))}
+			</div>
+		</div>
+	);
+}