coverage: update docs with baseline information

Author: danctorres

tools/coverage/README.md

@@ -1,47 +1,17 @@
 # Coverage tooling
 
-This project uses `llvm-cov` to generate coverage reports.
-
-## 1. Key Features
-
-1. **Local or Docker Setup:**
-   You can generate coverage reports by either installing `llvm-cov` locally or using the project's Docker environment.
-
-2. **Partial Coverage Reporting:**
-   Currently, the reports are generated **without a baseline**, meaning only files touched during test execution are included.
-
-   **TODO:** Implement baseline generation to include all project files in the coverage report, even those not covered by tests.
-
-## 2. Setup
-
-To set up the required tools, follow these steps:
-
-### 2.1. Without Docker
-
-1. Update packages:
-
-```bash
-sudo apt update
-```
-
-2. Install LLVM Install the default version of LLVM:
-
-```bash
-sudo apt install llvm
-```
-
-### 2.2. Within Docker
-
-For Docker setup, refer to the [README.md](../../README.md)
+This project uses `lcov` to generate coverage reports.
 
 ## How to Run
 
 To generate a coverage report, run the following command:
 
 ```bash
-bazel run //tools:llvm_cov -- -t <test> -o <output_dir>
+bazel run //tools/coverage:lcov -- -t <test_target> -b <baseline_target> -o <output_dir> -c $(bazel info bazel-bin) -d $(bazel info bazel-testlogs)
 ```
 
-Replace <test> with the name of the test target and <output_dir> with the desired output directory for the report.
+- `<test_target>` is the name of the test target.
+- `<baseline_target>` corresponds to the target used to create the coverage baseline.
+- `<output_dir>` with the desired output directory for the report.
 
 Open the generated `index.html` file in the output directory to review test coverage.