feat(stats): add launcher stats command and build integration

- Launcher stats subcommand with cleanup mode
- Stats frontend build integrated into Makefile
- CI workflow updated for stats package
- Config example updated with stats section
- mpv plugin menu entry for stats toggle

launcher/commands/command-modules.test.ts

@@ -7,6 +7,7 @@ import { runConfigCommand } from './config-command.js';
 import { runDictionaryCommand } from './dictionary-command.js';
 import { runDoctorCommand } from './doctor-command.js';
 import { runMpvPreAppCommand } from './mpv-command.js';
+import { runStatsCommand } from './stats-command.js';
 
 class ExitSignal extends Error {
   code: number;
@@ -128,3 +129,98 @@ test('dictionary command throws if app handoff unexpectedly returns', () => {
     /unexpectedly returned/,
   );
 });
+
+test('stats command launches attached app command with response path', async () => {
+  const context = createContext();
+  context.args.stats = true;
+  context.args.logLevel = 'debug';
+  const forwarded: string[][] = [];
+
+  const handled = await runStatsCommand(context, {
+    createTempDir: () => '/tmp/subminer-stats-test',
+    joinPath: (...parts) => parts.join('/'),
+    runAppCommandAttached: async (_appPath, appArgs) => {
+      forwarded.push(appArgs);
+      return 0;
+    },
+    waitForStatsResponse: async () => ({ ok: true, url: 'http://127.0.0.1:5175' }),
+    removeDir: () => {},
+  });
+
+  assert.equal(handled, true);
+  assert.deepEqual(forwarded, [
+    ['--stats', '--stats-response-path', '/tmp/subminer-stats-test/response.json', '--log-level', 'debug'],
+  ]);
+});
+
+test('stats cleanup command forwards cleanup vocab flags to the app', async () => {
+  const context = createContext();
+  context.args.stats = true;
+  context.args.statsCleanup = true;
+  context.args.statsCleanupVocab = true;
+  const forwarded: string[][] = [];
+
+  const handled = await runStatsCommand(context, {
+    createTempDir: () => '/tmp/subminer-stats-test',
+    joinPath: (...parts) => parts.join('/'),
+    runAppCommandAttached: async (_appPath, appArgs) => {
+      forwarded.push(appArgs);
+      return 0;
+    },
+    waitForStatsResponse: async () => ({ ok: true }),
+    removeDir: () => {},
+  });
+
+  assert.equal(handled, true);
+  assert.deepEqual(forwarded, [
+    [
+      '--stats',
+      '--stats-response-path',
+      '/tmp/subminer-stats-test/response.json',
+      '--stats-cleanup',
+      '--stats-cleanup-vocab',
+    ],
+  ]);
+});
+
+test('stats command throws when stats response reports an error', async () => {
+  const context = createContext();
+  context.args.stats = true;
+
+  await assert.rejects(
+    async () => {
+      await runStatsCommand(context, {
+        createTempDir: () => '/tmp/subminer-stats-test',
+        joinPath: (...parts) => parts.join('/'),
+        runAppCommandAttached: async () => 0,
+        waitForStatsResponse: async () => ({
+          ok: false,
+          error: 'Immersion tracking is disabled in config.',
+        }),
+        removeDir: () => {},
+      });
+    },
+    /Immersion tracking is disabled in config\./,
+  );
+});
+
+test('stats command fails if attached app exits before startup response', async () => {
+  const context = createContext();
+  context.args.stats = true;
+
+  await assert.rejects(
+    async () => {
+      await runStatsCommand(context, {
+        createTempDir: () => '/tmp/subminer-stats-test',
+        joinPath: (...parts) => parts.join('/'),
+        runAppCommandAttached: async () => 2,
+        waitForStatsResponse: async () => {
+          await new Promise((resolve) => setTimeout(resolve, 25));
+          return { ok: true, url: 'http://127.0.0.1:5175' };
+        },
+        removeDir: () => {},
+      });
+    },
+    /Stats app exited before startup response \(status 2\)\./,
+  );
+});

launcher/commands/stats-command.ts

@@ -0,0 +1,108 @@
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import { runAppCommandAttached } from '../mpv.js';
+import { sleep } from '../util.js';
+import type { LauncherCommandContext } from './context.js';
+
+type StatsCommandResponse = {
+  ok: boolean;
+  url?: string;
+  error?: string;
+};
+
+type StatsCommandDeps = {
+  createTempDir: (prefix: string) => string;
+  joinPath: (...parts: string[]) => string;
+  runAppCommandAttached: (
+    appPath: string,
+    appArgs: string[],
+    logLevel: LauncherCommandContext['args']['logLevel'],
+    label: string,
+  ) => Promise<number>;
+  waitForStatsResponse: (responsePath: string) => Promise<StatsCommandResponse>;
+  removeDir: (targetPath: string) => void;
+};
+
+const defaultDeps: StatsCommandDeps = {
+  createTempDir: (prefix) => fs.mkdtempSync(path.join(os.tmpdir(), prefix)),
+  joinPath: (...parts) => path.join(...parts),
+  runAppCommandAttached: (appPath, appArgs, logLevel, label) =>
+    runAppCommandAttached(appPath, appArgs, logLevel, label),
+  waitForStatsResponse: async (responsePath) => {
+    const deadline = Date.now() + 8000;
+    while (Date.now() < deadline) {
+      try {
+        if (fs.existsSync(responsePath)) {
+          return JSON.parse(fs.readFileSync(responsePath, 'utf8')) as StatsCommandResponse;
+        }
+      } catch {
+        // retry until timeout
+      }
+      await sleep(100);
+    }
+    return {
+      ok: false,
+      error: 'Timed out waiting for stats dashboard startup response.',
+    };
+  },
+  removeDir: (targetPath) => {
+    fs.rmSync(targetPath, { recursive: true, force: true });
+  },
+};
+
+export async function runStatsCommand(
+  context: LauncherCommandContext,
+  deps: StatsCommandDeps = defaultDeps,
+): Promise<boolean> {
+  const { args, appPath } = context;
+  if (!args.stats || !appPath) {
+    return false;
+  }
+
+  const tempDir = deps.createTempDir('subminer-stats-');
+  const responsePath = deps.joinPath(tempDir, 'response.json');
+
+  try {
+    const forwarded = ['--stats', '--stats-response-path', responsePath];
+    if (args.statsCleanup) {
+      forwarded.push('--stats-cleanup');
+    }
+    if (args.statsCleanupVocab) {
+      forwarded.push('--stats-cleanup-vocab');
+    }
+    if (args.logLevel !== 'info') {
+      forwarded.push('--log-level', args.logLevel);
+    }
+    const attachedExitPromise = deps.runAppCommandAttached(
+      appPath,
+      forwarded,
+      args.logLevel,
+      'stats',
+    );
+    const startupResult = await Promise.race([
+      deps.waitForStatsResponse(responsePath).then((response) => ({ kind: 'response' as const, response })),
+      attachedExitPromise.then((status) => ({ kind: 'exit' as const, status })),
+    ]);
+    if (startupResult.kind === 'exit') {
+      if (startupResult.status !== 0) {
+        throw new Error(`Stats app exited before startup response (status ${startupResult.status}).`);
+      }
+      const response = await deps.waitForStatsResponse(responsePath);
+      if (!response.ok) {
+        throw new Error(response.error || 'Stats dashboard failed to start.');
+      }
+      return true;
+    }
+    if (!startupResult.response.ok) {
+      throw new Error(startupResult.response.error || 'Stats dashboard failed to start.');
+    }
+    const exitStatus = await attachedExitPromise;
+    if (exitStatus !== 0) {
+      throw new Error(`Stats app exited with status ${exitStatus}.`);
+    }
+    return true;
+  } finally {
+    deps.removeDir(tempDir);
+  }
+}