Add portable single-file build under dist/

dist/odyssey-works-standalone.html inlines all assets (fonts, logo) into one
self-contained HTML for easy sharing. Untrack dist/ from .gitignore since it
now holds intentional content.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -7,8 +7,9 @@ Thumbs.db
 
 # Dependency / build dirs (none used today, but safe defaults)
 node_modules/
-dist/
 .cache/
 
+# Note: dist/ is tracked on purpose — it holds the portable single-file build.
+
 # Logs
 *.log

README.md

@@ -14,6 +14,8 @@ odyssey-works-site/
 ├── assets/
 │   ├── logo.png        # brand mark / favicon
 │   └── fonts/          # Space Grotesk + Space Mono (self-hosted woff2)
+├── dist/
+│   └── odyssey-works-standalone.html   # portable single-file build (assets inlined)
 └── README.md
 ```