itdove/devaiflow#350: Remove all references to deprecated DAF_AGENTS.md

[itdove]

This PR does not need a corresponding Jira item.

Related Issue: #350

Description

This PR removes all references to the deprecated DAF_AGENTS.md file and replaces them with the modern skill-based workflow approach. The changes consolidate agent-related documentation and functionality into the skill system, which provides a more maintainable and consistent user experience.

Key changes include:

• Removed or updated references to DAF_AGENTS.md across documentation files (README, installation guide, configuration reference)
• Updated AGENTS.md to align with skill-based workflow
• Modified devflow/cli/commands/new_command.py to remove DAF_AGENTS.md template generation
• Updated devflow/utils/daf_agents_validation.py to remove deprecated validation logic
• Refreshed context templates (JIRA.md) and skill documentation (daf-jira-fields/SKILL.md)
• Updated developer documentation to reflect current architecture

This refactoring improves maintainability by consolidating documentation in a single pattern and eliminates confusion between the deprecated agent model and the current skill-based approach.

Assisted-by: Claude

Testing

Steps to test

1. Pull down the PR
2. Search the codebase for any remaining references to DAF_AGENTS.md to verify complete removal
3. Run daf new command to verify it no longer attempts to create DAF_AGENTS.md file
4. Review updated documentation files to confirm skill-based workflow is properly referenced
5. Verify that CLI validation logic no longer checks for deprecated agent configuration
6. Run existing test suite to ensure no regressions in functionality

Scenarios tested

• Verified documentation links are valid and point to correct skill references
• Confirmed CLI command behavior no longer references deprecated agent model
• Validated that removed validation code does not break existing workflows

Deployment considerations

• This code change is ready for deployment on its own