Add ats-build skill for Claude harness

.claude/CLAUDE.md

@@ -21,94 +21,7 @@ preferences and working conventions. This file is gitignored and optional.
 
 ## Build Commands
 
-### Basic Build
-```bash
-# Configure (creates out-of-source build directory)
-cmake -B build
-
-# Build everything
-cmake --build build
-
-# Install (default: /usr/local)
-cmake --install build
-```
-
-### Common Build Presets
-```bash
-# Development build with compile_commands.json for IDE support
-cmake --preset dev
-cmake --build build-dev
-
-# Release build
-cmake --preset release
-cmake --build build-release
-
-# Build with autests enabled
-cmake --preset ci-fedora-autest
-cmake --build build-autest
-```
-
-### Useful Build Options
-```bash
-# Specify dependency locations (like autotools --with-*)
-cmake -B build -Djemalloc_ROOT=/opt/jemalloc -DOPENSSL_ROOT_DIR=/opt/boringssl
-
-# Build specific targets
-cmake --build build -t traffic_server
-cmake --build build -t format  # Format code before committing
-```
-
-### Key CMake Options
-- `BUILD_EXPERIMENTAL_PLUGINS=ON` - Enable experimental plugins
-- `ENABLE_QUICHE=ON` - QUIC/HTTP3 support
-- `ENABLE_CRIPTS=ON` - Cripts scripting API
-- `BUILD_REGRESSION_TESTING=ON` - Enable test suite
-- `ENABLE_ASAN=ON` - Configure ASan instrumentation
-
-## Testing
-
-### Unit Tests (Catch2)
-Built automatically with the project. Run via ctest:
-```bash
-ctest --test-dir build -j4
-```
-
-### Running a Single Unit Test
-Unit tests are built into executables. Find the test binary and run it directly:
-```bash
-# Unit tests are typically in build/src/<component>/
-./build/src/tscore/test_tscore
-```
-
-### End-to-End Tests (AuTest)
-
-**Enable autests during configuration:**
-```bash
-cmake -B build -DENABLE_AUTEST=ON
-cmake --build build
-cmake --install build
-```
-
-**Run all autests:**
-```bash
-cmake --build build -t autest
-```
-
-**Run specific test(s):**
-```bash
-cd build/tests
-pipenv install  # First time only
-./autest.sh --sandbox /tmp/sbcursor --clean=none -f <test_name_without_test_py>
-```
-
-For example, to run `cache-auth.test.py`:
-```bash
-./autest.sh --sandbox /tmp/sbcursor --clean=none -f cache-auth
-```
-
-Most end-to-end test coverage is in `tests/gold_tests/`. The CI system uses the
-Docker image `ci.trafficserver.apache.org/ats/fedora:43` (Fedora version updated
-regularly).
+Use the ats-build skill for building, testing, and formatting, unless instructed otherwise.
 
 ### Writing Autests
 

.claude/skills/ats-build/SKILL.md

@@ -0,0 +1,81 @@
+---
+name: ats-build
+description: Basic skills; formatting, compiling, testing, installing.
+---
+
+## Build Process
+
+1. Which `cmake --list-presets`?
+  * Need HTTP3? `ci-fedora-quiche`
+  * Not sure? Ask.
+2. No build directory yet? Configure one.
+3. Which target?
+4. Execute.
+
+## Reference
+
+### Configure Development Build
+
+```bash
+cmake --preset <name> [-B <build_dir>] -DENABLE_AUTEST=ON
+```
+
+### Build Code Target
+
+```bash
+cmake --build <build_dir> --target <executable_or_library_target>
+```
+
+### Run Unit Test
+
+```bash
+ctest --test-dir <build_dir> [-R <filter>]
+```
+
+### Format
+
+```bash
+cmake --build <build_dir> --target format
+```
+
+### Run AuTest
+
+Options correct? Check:
+
+```bash
+grep "^AUTEST_OPTIONS" <build_dir>/CMakeCache.txt
+```
+
+Correct? Run:
+
+```bash
+cmake --build <build_dir> --target autest
+```
+
+#### Example: Configure Build for Specific AuTest
+
+```bash
+cmake -B <build_dir> -DAUTEST_OPTIONS="-f <autest_name>"
+```
+
+### Install
+
+Install location OK? Check:
+
+```bash
+grep "^CMAKE_INSTALL_PREFIX" <build_dir>/CMakeCache.txt
+```
+
+Correct? Run:
+
+```bash
+cmake --install <build_dir>
+```
+
+## Key CMake Options
+
+- `BUILD_EXPERIMENTAL_PLUGINS=ON` - Enable experimental plugins
+- `ENABLE_QUICHE=ON` - QUIC/HTTP3 support
+- `ENABLE_CRIPTS=ON` - Cripts scripting API
+- `BUILD_REGRESSION_TESTING=ON` - Enable test suite
+- `ENABLE_ASAN=ON` - Configure ASan instrumentation