feat(tooling): Implement code coverage reporting (Task #44)

Added CMake support for coverage builds and a script to generate HTML reports using lcov on macOS. Also cleaned up .gitignore.

1 files changed, 15 insertions, 0 deletions

diff --git a/doc/HOWTO.md b/doc/HOWTO.md
index d402453..29492d5 100644
--- a/doc/HOWTO.md
+++ b/doc/HOWTO.md
@@ -117,6 +117,21 @@ ctest
 cd ..
 ```
 
+### Code Coverage (macOS only)
+
+To generate an HTML code coverage report for the project:
+
+1.  **Install lcov:**
+    ```bash
+    brew install lcov
+    ```
+
+2.  **Run the coverage script:**
+    ```bash
+    ./scripts/gen_coverage_report.sh
+    ```
+    This script will configure the build with `-DDEMO_ENABLE_COVERAGE=ON`, run the tests, and generate a report in `build_coverage/coverage_report/`. It will then attempt to open the report in your browser.
+
 ## Tools
 
 ### Updating Submodules