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-tools-panel.tsx

@@ -0,0 +1,81 @@
+/** Tools tab for the workspace detail page. */
+
+import { useState } from "react";
+import { Icon } from "../../icon";
+import { ToolStarter } from "../tool/tool-starter";
+import { useWorkspaceInstances } from "../../../hooks/use-workspace-instances";
+import type { Workspace } from "../../../types/workspace";
+
+interface WorkspaceToolsPanelProps {
+	workspace: Workspace;
+}
+
+export function WorkspaceToolsPanel({ workspace }: WorkspaceToolsPanelProps) {
+	const { instances, loading, refresh } = useWorkspaceInstances(workspace.id);
+	const [showModal, setShowModal] = useState(false);
+
+	return (
+		<div className="tools-tab">
+			{loading && <p className="muted">Loading instances...</p>}
+			{instances.length === 0 ? (
+				<div className="empty-state-card">
+					<Icon name="terminal" size="lg" />
+					<h3>No tools running</h3>
+					<p>Start a tool to begin coding in this workspace</p>
+					<button
+						className="btn btn-primary"
+						onClick={() => setShowModal(true)}
+						type="button"
+					>
+						Start Tool
+					</button>
+				</div>
+			) : (
+				<>
+					<div className="instances-grid">
+						{instances.map((instance) => (
+							<div
+								key={instance.id}
+								className={`instance-card ${instance.status}`}
+							>
+								<h4>{instance.display_name}</h4>
+								<span className="status-badge">{instance.status}</span>
+								{instance.url && (
+									<a
+										href={instance.url}
+										target={`instance-${instance.id}`}
+										rel="noreferrer"
+									>
+										Open
+									</a>
+								)}
+							</div>
+						))}
+					</div>
+					<button
+						className="btn btn-primary"
+						onClick={() => setShowModal(true)}
+						type="button"
+					>
+						Start Another Tool
+					</button>
+				</>
+			)}
+			{showModal && (
+				<div className="modal-overlay" onClick={() => setShowModal(false)}>
+					<div className="modal-content" onClick={(e) => e.stopPropagation()}>
+						<h3>Start Tool</h3>
+						<ToolStarter
+							workspace={workspace}
+							onStarted={() => {
+								setShowModal(false);
+								void refresh();
+							}}
+							onCancel={() => setShowModal(false)}
+						/>
+					</div>
+				</div>
+			)}
+		</div>
+	);
+}