feat(static): build script — dist/<app>/ + manifest-only media tree, baked API JSON, _redirects

Run via 'python -m tools.build_static' (avoids tools/http.py shadowing stdlib http).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

@@ -26,3 +26,7 @@ simulator/static/review_audio.html
 
 # Editor annotation/comment-thread metadata (not project content)
 .threads/
+
+# Static build outputs (tools/build_static.py)
+/dist/
+/dist-media/