Anchor lcov extract patterns to project directory

The previous patterns */include/* and */src/* were too broad and
matched vendored 3rdparty files. Anchor to */BehaviorTree.CPP/ to
ensure only the project's own source is included in coverage.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: facontidavide

.github/workflows/cmake_ubuntu.yml

@@ -86,8 +86,8 @@ jobs:
              --ignore-errors mismatch \
              --ignore-errors negative
         lcov --extract coverage.info \
-             '*/include/*' \
-             '*/src/*' \
+             '*/BehaviorTree.CPP/include/*' \
+             '*/BehaviorTree.CPP/src/*' \
              --output-file coverage.info \
              --ignore-errors unused
         lcov --list coverage.info