feat: full feature buildout — streaming, i18n, mastery map, admin, jobs

Progressive lesson streaming via onSegment callback (fixes SSE for non-English
users — locale was shadowed in lesson-reader useEffect). Adds: BullMQ workers,
Redis stream buffer, token budget enforcement, Langfuse tracing, golden-eval
runner, Playwright e2e scaffolding, lesson depth/locale/preferences schema,
mastery map UI, admin panel (blueprints/users/reports/quality/misconceptions),
image queries, source citations, view transitions, reading animations, i18n
(next-intl), PDF export, surprise endpoint, and 402 passing unit tests.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

jobs/bootstrap.ts

@@ -0,0 +1,30 @@
+/**
+ * Worker entrypoint. Stubs the `server-only` import guard before loading any
+ * src/lib code, then hands off to the real worker registry.
+ *
+ * Why: src/lib/** modules begin with `import 'server-only'` to keep RSC-only
+ * code out of client bundles. That package throws when required outside Next's
+ * React Server bundler. Workers are server code but run under plain Node/tsx,
+ * so we resolve `server-only` to a no-op here — and ONLY here, so the app's
+ * build-time guard is untouched. Mirrors the vitest alias in vitest.config.ts.
+ */
+import Module, { createRequire } from 'module';
+import { fileURLToPath } from 'url';
+import { dirname, join } from 'path';
+
+const here = dirname(fileURLToPath(import.meta.url));
+const NOOP = join(here, 'server-only.noop.cjs');
+
+type ResolveFn = (request: string, ...rest: unknown[]) => string;
+const moduleInternals = Module as unknown as { _resolveFilename: ResolveFn };
+const originalResolve = moduleInternals._resolveFilename;
+
+moduleInternals._resolveFilename = function (request, ...rest) {
+  if (request === 'server-only') return NOOP;
+  return originalResolve.call(this, request, ...rest);
+};
+
+// Load the worker graph *after* the stub is installed (require keeps it
+// synchronous — tsx compiles this file to CJS, where top-level await is unavailable).
+const require = createRequire(import.meta.url);
+require('./index');