Fix: auto-include router spec module when boot adapter is present

boot.sx uses parse-route-pattern from router.sx, but router was only
included as an opt-in spec module. Now auto-included when boot is in
the adapter set.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/sx/ref/bootstrap_js.py

@@ -1199,6 +1199,9 @@ def compile_ref_to_js(
             if sm not in SPEC_MODULES:
                 raise ValueError(f"Unknown spec module: {sm!r}. Valid: {', '.join(SPEC_MODULES)}")
             spec_mod_set.add(sm)
+    # boot.sx uses parse-route-pattern from router.sx
+    if "boot" in adapter_set:
+        spec_mod_set.add("router")
     has_deps = "deps" in spec_mod_set
     has_router = "router" in spec_mod_set