feat(desktop): add scoped terminal drawer

.qwen/e2e-tests/electron-desktop/terminal-drawer.md

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+# Electron Desktop E2E Record: Terminal Drawer
+
+Date: 2026-04-25
+
+## Slice
+
+Slice 13 basic scoped terminal.
+
+## User-Visible Scenario
+
+1. Launch the desktop app with a temporary HOME/QWEN_RUNTIME_DIR and fake ACP.
+2. Open a temporary project directory.
+3. Use the bottom Terminal drawer to run a harmless command.
+4. Verify command output appears in the drawer.
+5. Start a long-running command and click Kill.
+6. Click Clear and verify the drawer output resets.
+
+## Assertions
+
+- `POST /api/terminals` requires a registered project id and non-empty command.
+- Terminal cwd is resolved from the registered project path server-side.
+- `GET /api/terminals/:id` returns output and exit status.
+- `POST /api/terminals/:id/kill` marks a running terminal as killed.
+- Renderer terminal controls are visible in the bottom drawer and do not use
+  Node integration.
+
+## Diagnostics on Failure
+
+- Save renderer screenshot.
+- Save renderer console errors and failed network requests.
+- Save Electron main stdout/stderr.
+- Save DesktopServer terminal route responses.
+- Save the temporary workspace path and command used.
+
+## Automated Coverage Added This Iteration
+
+The full Electron E2E harness is still pending. This iteration added
+server-level coverage in `packages/desktop/src/server/index.test.ts`:
+
+- runs `printf terminal-output` scoped to a registered project;
+- polls `/api/terminals/:id` until output and exit code are available;
+- starts a long-running Node command and verifies `/kill` returns `killed`.
+
+## Execution Results
+
+- `npm run test --workspace=packages/desktop` passed: 8 files, 52 tests.
+- `npm run typecheck --workspace=packages/desktop` passed.
+- `npm run lint --workspace=packages/desktop` passed.
+- `npm run build --workspace=packages/desktop` passed.
+
+## Remaining Risk
+
+The current terminal is a command runner, not a full interactive PTY. PTY
+write/resize, output selection/copy polish, send-output-to-AI, terminal tabs,
+history, and real Electron renderer assertions remain required before the MVP
+can be marked done.