Release v5.3.0 - Dashboard Enhancements and Help System

## Added
- Agent display names for human-readable dashboard labels
  - Optional display_name parameter in agent heartbeats
  - Frontend lookup map translates agent IDs across all sections
  - Demo updated with descriptive names (Code Analyzer, Test Generator, etc.)

- Comprehensive dashboard help panel
  - 5 accordion sections explaining dashboard features
  - Clarifies dashboard is optional for basic workflows
  - Redis installation instructions for Docker, macOS, Linux
  - Improved accessibility with proper button type attributes

## Changed
- Dashboard UX improvements
  - "Source:" changed to "Source Agent:" in Event Stream
  - Redis status message updated to "Redis Requires Enabling"
  - Display names shown consistently across all dashboard sections
  - Date-based cache busting for reliable browser updates

- Test infrastructure
  - Disabled parallel execution to fix import timing issues
  - Sequential test execution (-n 0 in pytest.ini)
  - Removed duplicate test file (test_info_coverage_boost.py)
  - Cleared __pycache__ to resolve import conflicts

## Documentation
- Root directory cleanup (8 files moved to .archive/)
- Removed duplicate dashboard documentation files
- Moved historical testing session summaries to archive
- Fixed misleading context window claim in README

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

Author: silversurfer562