fix(conformance): restore computed modelToApiJava in cross-port manifest

The prior review fix zeroed OrderSummary.modelToApiJava, but the TS conformance
re-derives that field as the computed contract path (apiSurfaceHref), so live!=committed
broke. Regenerated from the oracle; only that one template field changes. The Java
side asserts apiJavaPath/apiJavaToModel (unaffected). All ported strict runners green.

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

Author: dmealing

fixtures/conformance/api-docs-cross-port/expected-paths.json

@@ -30,7 +30,7 @@
       "apiTsPath": "api/ts/acme/shop/OrderSummary.md",
       "apiJavaPath": "api/java/acme/shop/OrderSummary.md",
       "modelToApiTs": "",
-      "modelToApiJava": "",
+      "modelToApiJava": "../../api/java/acme/shop/OrderSummary.md",
       "apiTsToModel": "../../../../acme/shop/OrderSummary.md",
       "apiJavaToModel": "../../../../acme/shop/OrderSummary.md"
     },