Document shared workflow detection feature

Updates documentation to reflect the shared workflow detection feature
added in PR #8468. Workflows without an 'on' field are now automatically
detected as shared workflow components and skip compilation with an
informative message.

Changes:
- Added shared workflow detection notes to CLI compile command docs
- Added new "Shared Workflow Components" section to imports reference
- Included example output showing the compiler's informative message

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: github-actions[bot]

docs/src/content/docs/reference/imports.md

@@ -39,6 +39,33 @@ Workflow instructions here...
 {{#import shared/common-tools.md}}
 ```
 
+## Shared Workflow Components
+
+Workflows without an `on` field are automatically detected as shared workflow components. These files are validated but not compiled into GitHub Actions, as they are meant to be imported by other workflows. When you attempt to compile a shared workflow directly, the compiler displays an informative message and skips compilation:
+
+```bash wrap
+$ gh aw compile shared/mcp/deepwiki.md
+ℹ️  Shared agentic workflow detected: deepwiki.md
+
+This workflow is missing the 'on' field and will be treated as a shared workflow component.
+Shared workflows are reusable components meant to be imported by other workflows.
+
+To use this shared workflow:
+  1. Import it in another workflow's frontmatter:
+     ---
+     on: issues
+     imports:
+       - shared/mcp/deepwiki.md
+     ---
+
+  2. Compile the workflow that imports it
+
+Skipping compilation.
+✓ Compiled 1 workflow(s): 0 error(s), 0 warning(s)
+```
+
+This allows you to organize reusable components in your repository without generating unnecessary lock files.
+
 ## Path Formats
 
 Import paths support local files (`shared/file.md`, `../file.md`), remote repositories (`owner/repo/file.md@v1.0.0`), and section references (`file.md#SectionName`). Optional imports use `{{#import? file.md}}` syntax in markdown.

docs/src/content/docs/setup/cli.md

@@ -208,6 +208,8 @@ gh aw compile --purge                      # Remove orphaned .lock.yml files
 
 **Strict Mode (`--strict`):** Enforces security best practices: no write permissions (use [safe-outputs](/gh-aw/reference/safe-outputs/)), explicit `network` config, no wildcard domains, pinned Actions, no deprecated fields. See [Strict Mode reference](/gh-aw/reference/frontmatter/#strict-mode-strict).
 
+**Shared Workflows:** Workflows without an `on` field are automatically detected as shared workflow components intended for import by other workflows. These files are validated using a relaxed schema that permits optional markdown content and skip compilation with an informative message. To use a shared workflow, import it in another workflow's frontmatter or with markdown directives. See [Imports reference](/gh-aw/reference/imports/).
+
 ### Testing
 
 #### `trial`