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/compiled-worker.out.txt

@@ -0,0 +1,7 @@
+[C] worker started pid=1036397 version=v1 runtime=deno 2.9.7
+[C] run=a8a8a202 step=work 
+[C] run=d1692ed7 step=work 
+[C] run=617df139 step=work 
+[C] run=e22ffd1b step=work 
+[C] run=6692a31b step=work 
+[C] worker stopped gracefully