Adds some comments and migration prompt

Entire-Checkpoint: 01M59MGHH1S8Z9WRMSJXPFJ8FV

prompts/migrate-lts-viewer.prompt.md

@@ -231,7 +231,7 @@ Never commit generated .idl, .h, .hpp, or .cpp outputs. Never consume generated
 
 ## Tests
 
-For every C++ code change, add three meaningful CTest tests where feasible.
+For every C++ code change, add three meaningful CTest tests where feasible (unittests, functional tests, integration tests).
 
 Rules:
 
@@ -352,7 +352,6 @@ Success requires:
 - required stubs/forward declarations are only in allowed directories
 - removed modules remain removed
 - LogViewer remains preserved
-- RoutingServiceNG prompt rules are followed
 - RTI/codegen and Grantlee/KTextTemplate success is real, not stale or faked
 
 ## If blocked
@@ -387,8 +386,6 @@ Keep it short. Include:
 - stub/forward-declaration moves or removals
 - Docker and Jenkins CI changes
 - Qt5 references removed or remaining
-- confirmation that removed modules were not restored
-- confirmation that LogViewer was preserved
 - exact validation commands and results
 - result of new_docker-build.h if present
 - remaining blockers or risks