Creates a simplified docs preview action that comments on PRs with Vercel preview links.
The action shows changed files and highlights newly added documentation from manifest.json.

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…o use the same SHA and version (v45.0.7) that the docs-ci.yaml workflow uses.\n\n\ud83e\udd16 Generated with [Claude Code](https://claude.ai/code)\n\nCo-Authored-By: Claude <noreply@anthropic.com>\

…d to match patterns from the successful pr-deploy.yaml workflow:\n- Added job-level pull-requests write permission\n- Added explicit env var for PR_NUMBER\n- Added explicit GITHUB_TOKEN environment variable\n- Added reactions-edit-mode for consistency\n\n\ud83e\udd16 Generated with [Claude Code](https://claude.ai/code)\n\nCo-Authored-By: Claude <noreply@anthropic.com>\

Create a unified composite action for docs-related workflows:
- Handles file change detection with tj-actions/changed-files
- Provides linting and formatting for markdown files
- Generates preview links for documentation changes
- Creates or updates PR comments with preview links
- Includes special handling for manifest.json changes
- Implements security best practices
- Provides example workflow

Combines features from PRs #17317, #17322, and #17370:
- Adds Vale style checking for documentation
- Creates a reusable workflow for documentation validation
- Optimizes PR checks and post-merge validation
- Adds automatic GitHub issue creation for broken links
- Updates all documentation checks to run in a structured manner

This PR supersedes:
- PR #17317: Docs Preview GitHub Action
- PR #17322: Shared Docs GitHub Action
- PR #17370: Vale Style Checking and Docs Workflow Improvements

- Adds cross-reference validation to detect broken links when files or headings change
- Centralizes file processing for better efficiency
- Creates a reusable docs-setup action to reduce redundancy
- Updates PR comment with cross-reference validation results
- Improves documentation with updated features
- Optimizes code for better maintainability

…ections

- Adds status overview with emoji indicators for each check
- Organizes results into collapsible sections for better readability
- Provides specific guidance on how to fix each type of issue
- Includes detailed contextual information for Vale style issues
- Makes output more scannable and actionable for contributors
- Links to documentation for additional reference

- Move Vale installation to docs-setup action for better reusability
- Remove duplicate Vale installation step from shared action
- Add empty file check to Vale style checking for robustness
- Update workflow to conditionally install Vale based on input parameter
- Make Vale configuration more explicit with improved comments
- Ensure consistent use of pre-processed file lists

- Add unified results aggregation and reporting
- Organize workflow into clear phases for concurrent execution
- Enhance docs-shared action with better dependency structure
- Update post-merge checks to include cross-reference validation
- Remove Slack notification in favor of GitHub issues
- Improve README with updated architecture documentation

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

- Replace umbrelladocs/action-linkspector with lycheeverse/lychee-action
- Create .lycheeignore file with the same patterns from linkspector
- Update all workflows to use lychee with the new config
- Update action outputs to support lychee's format
- Remove .linkspector.yml as it's no longer needed
- Enhanced documentation to reflect the tool change

Reasons for the change:
- Lychee is faster (written in Rust)
- Better maintained and more widely used
- More flexible configuration options
- Improved error handling and reporting

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

- Unify all validation checks into a single composite action
- Add validation status aggregation with JSON results
- Simplify preview URL generation with direct document links
- Replace verbose file formatting with targeted doc links
- Improve error handling for all validation steps
- Organize workflow into clear phases for concurrent execution
- Remove file count and time tracking per requirements
- Fix input parameter references for check-format
- Add cross-reference validation with detailed reporting

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

- Fix branch name extraction with fallbacks for CI environments
- Add conditional handling for PR context in docs-unified workflow
- Improve error handling in cross-reference validation
- Use fixed string matching instead of regex for safer pattern matching
- Remove hardcoded assignee in favor of team assignments
- Improve JSON parsing with proper error handling for lychee results
- Add more reliable newline handling for GitHub issue creation

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

- Add more detailed descriptions of workflow components
- Document status badge generation and thresholds
- Clarify validation options and phases
- Update preview generation details
- Add examples of direct document links
- Improve workflow composite action description

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

- Remove duplicate 'Docs Shared Example' workflows to prevent confusion
- Fix lychee-action configuration in docs-link-check.yaml
- Update node setup cache configuration to include multiple lock files

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- Change from ignore-file parameter to --config flag in args
- Use v1 tag instead of pinning to specific version

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

- Fix indentation in heredoc section to conform to YAML syntax rules

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

- Update references to use ^45 instead of pinned SHAs or specific versions
- This allows automatic minor version updates while keeping major version stable

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

- Update tj-actions/changed-files to use v45 tag instead of caret versioning
- Fix preview URLs for branches with slashes by replacing with dashes
- Ensure consistent branch name handling across docs-shared and docs-preview actions

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