Add Claude Code skills for content development workflows

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

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+---
+name: build-product
+description: Build a ComplianceAsCode product
+---
+
+# Build Product
+
+Build a ComplianceAsCode product.
+
+**Product**: $ARGUMENTS
+
+## Tool Strategy
+
+This skill uses `mcp__content-mcp__*` tools when available (preferred — deterministic, structured results). When the MCP server is not configured, fall back to filesystem-based alternatives noted as **Fallback** in each step. See `.claude/skills/shared/mcp_fallbacks.md` for detailed fallback procedures. The skill must complete successfully either way.
+
+## Phase 1: Validate Product
+
+1. **Check if product is valid**:
+   Use `mcp__content-mcp__get_product_details` with `product_id=$ARGUMENTS` to validate the product exists and get its metadata.
+   **Fallback**: Read `products/$ARGUMENTS/product.yml` directly. If the file doesn't exist, the product is invalid.
+
+2. **If product not found**, list available products:
+   Use `mcp__content-mcp__list_products` to get all available products.
+   **Fallback**: Run `ls products/` to list available product directories.
+
+3. **If no product specified**, ask user using AskUserQuestion:
+   - Use the product list to populate options
+   - Allow "Other" for unlisted products
+
+## Phase 2: Build Product
+
+**Always use the `build_product` script.** Do not use CMake, make, or ninja directly.
+
+Parse user arguments for optional flags:
+- `--datastream-only` — skip guides, tables, playbooks (faster)
+- `--rule-id <rule_id>` — build only a specific rule (fastest, for testing)
+
+Build command:
+```bash
+./build_product [flags] $PRODUCT
+```
+
+Examples:
+```bash
+./build_product rhel9                                          # Full build
+./build_product --datastream-only rhel9                        # Data stream only
+./build_product --datastream-only --rule-id sshd_set_idle_timeout rhel9  # Single rule
+```
+
+### Build Output
+
+Monitor build progress:
+- CMake configuration
+- Content resolution
+- OVAL generation
+- XCCDF generation
+- Data stream assembly
+
+Expected artifacts in `build/`:
+- `ssg-$ARGUMENTS-ds.xml` - SCAP data stream
+- `ssg-$ARGUMENTS-ds-1.2.xml` - SCAP 1.2 data stream
+- `ssg-$ARGUMENTS-xccdf.xml` - XCCDF document
+- `ssg-$ARGUMENTS-oval.xml` - OVAL definitions
+- `guides/` - HTML guides (skipped with `--datastream-only`)
+- `ansible/` - Ansible playbooks (skipped with `--datastream-only`)
+- `bash/` - Bash scripts (skipped with `--datastream-only`)
+
+## Phase 3: Verify Build Success
+
+1. **Check build exit code**:
+   - Exit 0 = Success
+   - Non-zero = Build failed
+
+2. **Verify key artifacts exist**:
+   Use `mcp__content-mcp__get_datastream_info` with `product=$ARGUMENTS` to verify the datastream was built successfully and get artifact details.
+   **Fallback**: Check files directly:
+   ```bash
+   ls -la build/ssg-$ARGUMENTS-ds.xml
+   ls -la build/ssg-$ARGUMENTS-xccdf.xml
+   ls -la build/ssg-$ARGUMENTS-oval.xml
+   ```
+
+3. **Check for build warnings**:
+   - Look for deprecation warnings
+   - Template processing warnings
+   - Missing reference warnings
+
+## Phase 4: Report Results
+
+### Success Report
+
+```
+Build Complete
+==============
+
+Product: $ARGUMENTS
+
+Build Status: SUCCESS
+  Artifacts:
+    - build/ssg-$ARGUMENTS-ds.xml
+    - build/ssg-$ARGUMENTS-xccdf.xml
+    - build/ssg-$ARGUMENTS-oval.xml
+
+Ready for:
+  - Validation tests: /run-tests
+  - Automatus testing: /test-rule <rule_id>
+  - OpenSCAP scanning: oscap xccdf eval --profile <profile> build/ssg-$ARGUMENTS-ds.xml
+  - PR creation
+```
+
+### Build Failure Report
+
+```
+Build Failed
+============
+
+Product: $ARGUMENTS
+
+Error Output:
+[error message from build]
+
+Common Causes:
+  1. Jinja2 template syntax error in rule.yml
+  2. Missing macro or variable reference
+  3. Invalid platform specification
+  4. Circular dependency in profiles
+
+Debugging Steps:
+  1. Check the specific file mentioned in the error
+  2. Validate YAML: python3 -c "import yaml; yaml.safe_load(open('path/to/file.yml'))"
+  3. Check Jinja2: Look for unclosed tags, missing macros
+  4. Review recent changes: git diff HEAD~1
+```
+
+## Troubleshooting
+
+### Common Build Errors
+
+1. **Python import errors**:
+   ```bash
+   pip3 install -r requirements.txt
+   pip3 install -r test-requirements.txt
+   ```
+
+2. **Missing dependencies**:
+   ```bash
+   # RHEL/Fedora
+   dnf install cmake make openscap-utils python3-pyyaml python3-jinja2
+   ```
+
+3. **Jinja2 errors**:
+   - Check for undefined macros
+   - Verify macro imports in the file
+   - Check for syntax errors in `{{{ }}}` blocks
+
+4. **OVAL validation errors**:
+   - Check template parameters match expected types
+   - Verify referenced variables exist
+   - Check platform applicability
+
+### Verbose Build
+
+For more detailed output:
+```bash
+./build_product $ARGUMENTS 2>&1 | tee build.log
+```