Clean up test suite per 3-way code review findings

- Remove temp files: network_gcd_traversal.log, util_report_redirect.log
- Delete 19 comment-only C++ test stubs (dead code for removed APIs)
- Remove redundant graph_make_verify test (covered by graph_advanced)
- Centralize assert_file_nonempty/assert_file_contains into test/helpers.tcl
  and remove inline copies from 17 verilog test files
- Fix Build.sh stray quotes in heredoc output
- Fix regression.sh unquoted variable expansions
- Update .gitignore: add */test/*.log and Testing/

All 6087 tests pass.

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Jaehyun Kim <jhkim@precisioninno.com>

Author: jhkim-pii

.gitignore

@@ -30,3 +30,7 @@ doc/messages.txt
 
 # clangd turds
 .cache/
+
+# test artifacts
+*/test/*.log
+Testing/

etc/Build.sh

@@ -16,8 +16,8 @@ elif [[ "$OSTYPE" == "darwin"* ]]; then
   numThreads=$(sysctl -n hw.ncpu)
 else
   cat << EOF
-WARNING: Unsupported OSTYPE: cannot determine number of host CPUs"
-  Defaulting to 2 threads. Use -threads=N to use N threads"
+WARNING: Unsupported OSTYPE: cannot determine number of host CPUs
+  Defaulting to 2 threads. Use -threads=N to use N threads
 EOF
   numThreads=2
 fi

graph/test/CMakeLists.txt

@@ -5,7 +5,6 @@ sta_module_tests("graph"
     delay_corners
     delete_modify
     incremental
-    make_verify
     modify
     operations
     timing_edges