feat(cli): add sessions list/resume/destroy subcommands (#146)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

packages/cli/src/cli.ts

@@ -106,6 +106,117 @@ program
     },
   );
 
+// ─── sessions ───────────────────────────────────────────────────────────
+
+const sessionsCmd = program.command('sessions').description('Manage active agent sessions');
+
+sessionsCmd
+  .command('list')
+  .description('List active agent sessions')
+  .option('-g, --gateway <url>', 'Gateway URL', 'http://localhost:4000')
+  .action(async (opts: { gateway: string }) => {
+    const { loadSession, validateSession } = await import('./auth.js');
+    const { fetchSessions } = await import('./tui/gateway-api.js');
+
+    const session = loadSession(opts.gateway);
+    if (!session) {
+      console.error('Not signed in. Run `mosaic login` first.');
+      process.exit(1);
+    }
+
+    const valid = await validateSession(opts.gateway, session.cookie);
+    if (!valid) {
+      console.error('Session expired. Run `mosaic login` again.');
+      process.exit(1);
+    }
+
+    try {
+      const result = await fetchSessions(opts.gateway, session.cookie);
+      if (result.total === 0) {
+        console.log('No active sessions.');
+        return;
+      }
+      console.log(`Active sessions (${result.total}):\n`);
+      for (const s of result.sessions) {
+        const created = new Date(s.createdAt).toLocaleString();
+        const durationSec = Math.round(s.durationMs / 1000);
+        console.log(`  ID:       ${s.id}`);
+        console.log(`  Model:    ${s.provider}/${s.modelId}`);
+        console.log(`  Created:  ${created}`);
+        console.log(`  Prompts:  ${s.promptCount}`);
+        console.log(`  Duration: ${durationSec}s`);
+        if (s.channels.length > 0) {
+          console.log(`  Channels: ${s.channels.join(', ')}`);
+        }
+        console.log('');
+      }
+    } catch (err) {
+      console.error(err instanceof Error ? err.message : String(err));
+      process.exit(1);
+    }
+  });
+
+sessionsCmd
+  .command('resume <id>')
+  .description('Resume an existing agent session in the TUI')
+  .option('-g, --gateway <url>', 'Gateway URL', 'http://localhost:4000')
+  .action(async (id: string, opts: { gateway: string }) => {
+    const { loadSession, validateSession } = await import('./auth.js');
+
+    const session = loadSession(opts.gateway);
+    if (!session) {
+      console.error('Not signed in. Run `mosaic login` first.');
+      process.exit(1);
+    }
+
+    const valid = await validateSession(opts.gateway, session.cookie);
+    if (!valid) {
+      console.error('Session expired. Run `mosaic login` again.');
+      process.exit(1);
+    }
+
+    const { render } = await import('ink');
+    const React = await import('react');
+    const { TuiApp } = await import('./tui/app.js');
+
+    render(
+      React.createElement(TuiApp, {
+        gatewayUrl: opts.gateway,
+        conversationId: id,
+        sessionCookie: session.cookie,
+      }),
+    );
+  });
+
+sessionsCmd
+  .command('destroy <id>')
+  .description('Terminate an active agent session')
+  .option('-g, --gateway <url>', 'Gateway URL', 'http://localhost:4000')
+  .action(async (id: string, opts: { gateway: string }) => {
+    const { loadSession, validateSession } = await import('./auth.js');
+    const { deleteSession } = await import('./tui/gateway-api.js');
+
+    const session = loadSession(opts.gateway);
+    if (!session) {
+      console.error('Not signed in. Run `mosaic login` first.');
+      process.exit(1);
+    }
+
+    const valid = await validateSession(opts.gateway, session.cookie);
+    if (!valid) {
+      console.error('Session expired. Run `mosaic login` again.');
+      process.exit(1);
+    }
+
+    try {
+      await deleteSession(opts.gateway, session.cookie, id);
+      console.log(`Session ${id} destroyed.`);
+    } catch (err) {
+      console.error(err instanceof Error ? err.message : String(err));
+      process.exit(1);
+    }
+  });
+
 // ─── prdy ───────────────────────────────────────────────────────────────
 
 const prdyWrapper = buildPrdyCli();