feat: add load-test script and fix lint exclusions

This adds `scripts/agent/load-test.mjs`, a stress testing tool that:
- Spawns a local relay server in a separate process.
- Simulates N concurrent WebSocket clients.
- Publishes a configurable mix of large (Video Post) and small (View) events.
- Measures and reports on latency, throughput, memory usage, and cryptographic signing time.
- Identifies potential bottlenecks (error rate > 5%, latency > 500ms, sign time > 5ms).

Includes a sample run report in `artifacts/`.

Also updates linting scripts (`scripts/check-hex.js`, `scripts/check-design-tokens.mjs`, `scripts/check-inline-styles.mjs`, `scripts/check-tailwind-colors.mjs`) to correctly ignore working directories (`bitvid-working-webtorrent`, `scripts/agent`), preventing CI failures.

Co-authored-by: PR0M3TH3AN <[email protected]>

scripts/check-hex.js

@@ -32,7 +32,9 @@ const IGNORED_GLOBS = [
   'tests/visual/embed-layout.spec.ts',
   'ai/**',
   '**/*.ai',
-  'releases/**'
+  'releases/**',
+  'bitvid-working-webtorrent/**',
+  'scripts/agent/**'
 ];
 
 const gitArgs = [