feat(studio): add Run Eval flow with suite filter, test-id filter, and target override (#947)

- Add eval-runner.ts: Hono API endpoints for discovery, launch, and status polling
  - GET /api/eval/discover: discovers eval files in project
  - GET /api/eval/targets: lists available target names
  - POST /api/eval/run: spawns CLI eval process with validated args
  - GET /api/eval/status/:id: polls running eval status
  - POST /api/eval/preview: generates CLI command preview
  - All endpoints also available project-scoped under /api/projects/:projectId/eval/*

- Add RunEvalModal component: two-step wizard modal
  - Step 1: suite filter (text input with discovered file suggestions), test-id
    pills (repeatable with glob support), target override (searchable dropdown)
  - Step 2: advanced options (threshold, workers, dry-run) collapsed by default
  - Live CLI preview before launch
  - Run status view with stdout/stderr streaming after launch

- Add entry points on every relevant page:
  - Home page (both single-project and multi-project): 'Run Eval' button
  - Run detail page: 'Re-run with Filters' (prefilled with current target)
  - Eval detail page: 'Run this Test' (prefilled with test ID and target)
  - All project-scoped variants included

Closes #945

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: christso

apps/cli/src/commands/results/eval-runner.ts

@@ -46,6 +46,7 @@ import { parseJsonlResults } from '../eval/artifact-writer.js';
 import { resolveRunManifestPath } from '../eval/result-layout.js';
 import { loadRunCache, resolveRunCacheFile } from '../eval/run-cache.js';
 import { listResultFiles } from '../trace/utils.js';
+import { registerEvalRoutes } from './eval-runner.js';
 import {
   loadLightweightResults,
   loadManifestResults,
@@ -892,6 +893,18 @@ export function createApp(
   app.get('/api/projects/:projectId/targets', (c) => withProject(c, handleTargets));
   app.get('/api/projects/:projectId/feedback', (c) => withProject(c, handleFeedbackRead));
 
+  // ── Eval runner routes (discovery, launch, status) ────────────────────
+
+  registerEvalRoutes(app, (c) => {
+    // For project-scoped routes, resolve to project path; otherwise use searchDir
+    const projectId = c.req.param('projectId');
+    if (projectId) {
+      const project = getProject(projectId);
+      if (project) return project.path;
+    }
+    return searchDir;
+  });
+
   // ── Static file serving for Studio SPA ────────────────────────────────
 
   const studioDistPath = options?.studioDir ?? resolveStudioDistDir();