Removes BUILD_RTI=OFF from reference prompt

prompts/combined-migration-subfolder-dds-rti-compact.prompt.md

@@ -110,7 +110,6 @@ If RTI requires environment variables or explicit license-path configuration, se
 Validate in Docker. If supported, validate both:
 
 - `BUILD_RTI=ON`
-- `BUILD_RTI=OFF`
 
 For each relevant variant:
 1. configure
@@ -131,7 +130,7 @@ Use `/repo`-based paths. Adapt only if repository inspection proves it is requir
 - `cmake --build /repo/build --parallel`
 - `ctest --test-dir /repo/build --output-on-failure`
 
-Add explicit `BUILD_RTI=ON` / `BUILD_RTI=OFF` configure flags if supported.
+Add explicit `BUILD_RTI=ON` configure flags if supported.
 
 ## If Tools Are Missing
 - identify the exact missing dependency
@@ -146,7 +145,6 @@ Report only the essentials:
 - whether generation timing was correct
 - whether output placement was correct
 - whether `BUILD_RTI=ON` succeeded
-- whether `BUILD_RTI=OFF` succeeded
 - whether `/repo/external/rti_connext_dds-7.7.0` worked
 - whether `./rti_license.dat` mapping worked
 - exact Docker commands used