fix(comments): correct canary justification and expand failure guidance in padding tests

CMakeLists.txt

@@ -604,15 +604,15 @@ target_link_libraries(app_version_tests PRIVATE app_version)
 add_test(NAME app_version_tests COMMAND app_version_tests)
 
 # Anti-normalization padding canary (see tests/test_app_version_padding.cpp for the full
-# rationale). The live-version assertions in app_version_tests can only DETECT a
-# "reconstruct the string from numeric components" regression when the live version
-# happens to be zero-padded — at an unpadded version (e.g. 0.9.8) the reconstruction
-# coincides with the verbatim string and the check silently goes vacuous. So: run the
-# SAME version_generated.h.in template through configure_file a second time with a
-# SYNTHETIC padded version, and compile the SAME src/app_version.cpp against that header
-# (include-dir substitution — the canary target never sees the live generated/ dir).
-# The "0.9.01" here is a permanent test fixture, NOT the shipped version (see also the
-# source-of-truth comment at the top of this file for the live-version invariant); it
+# rationale). The live-version assertions in app_version_tests are version-shape-blind:
+# relative checks (e.g. appVersion() == stampVersion()) hold whether the string was
+# threaded verbatim or reconstructed from numeric components, at any version, padded or
+# not — the live suite cannot detect a reconstruct-from-components regression at all.
+# So: run the SAME version_generated.h.in template through configure_file a second time
+# with a SYNTHETIC padded version, and compile the SAME src/app_version.cpp against that
+# header (include-dir substitution — the canary target never sees the live generated/
+# dir). The "0.9.01" here is a permanent test fixture, NOT the shipped version (see also
+# the source-of-truth comment at the top of this file for the live-version invariant); it
 # must match the literals in test_app_version_padding.cpp and must never be bumped on
 # release.
 #