docs(spikes): Deno 2.9.7 + TS 7 compatibility spike and ADR-004

Co-Authored-By: Claude Fable 5.1 <[email protected]>

spikes/deno/logs/docker.txt

@@ -0,0 +1,12 @@
+image size 260MB
+health: {"ok":true,"runtime":"deno 2.9.7","ts":"6.0.3"}
+/ -> 200 text/html; charset=utf-8
+/settings (SPA fallback) -> 404 text/plain; charset=UTF-8
+assets/manifest-f425e467.js -> 200 text/javascript; charset=utf-8
+sse: 3 events
+docker stop (SIGTERM) took .309456482s
+logs:
+listening 8080
+shutdown
+server finished
+/settings (SPA fallback, container) -> 200 text/html; charset=utf-8