feat(cli): add strict workflow YAML validation command

[jrg94-ua]

Fixes #3376
/claim #3376

Summary

This PR implements a new CLI command for validating Keep workflow YAML files, addressing issue #3376. The new �alidate command ensures strict syntax and structure compliance for workflow definitions, providing clear feedback and robust error handling.

Features

• New Command: keep workflow validate --file
• Strict Validation:
  • Checks for required top-level keys (workflow, id,
    ame, riggers)
  • Ensures correct types and non-empty values
  • Validates triggers, steps, and actions structure
  • Handles all error cases with clear, English messages
• User Feedback:
  • Success and error messages are styled and informative
  • Outputs summary of validated workflow on success
• Robust Error Handling:
  • Handles missing files, YAML syntax errors, and invalid structure gracefully

Testing

• Comprehensive test suite: ests/test_workflow_validate.py (covers all edge cases and error conditions)
• Manual validation against all real workflows in the repository
• All outputs and error messages are in English

Demo

A full demo of the new validation command is available here:
YouTube Video Demo

Files Changed

• keep/cli/cli.py (new �alidate command and logic)
• ests/test_workflow_validate.py (test cases for validation)

Notes

• No temporary or demo files are included in this PR.
• All requirements from the issue and bounty have been strictly followed.
• Code has been reviewed for style, syntax, and consistency with the repository.

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