chore: promote dev changes to master

[DevStrikerTech]

Summary

This PR promotes the latest reviewed updates from dev into master, including the new config lint CLI capability and recent documentation refinements.

Changes Included

• Added YAML config lint command (scripts/lint_configs.py) with:
  • directory path validation
  • YAML syntax checks using safe parsing
  • helpful error hints for invalid files
• Added tests for lint command behavior (tests/test_lint_configs.py)
• Included small README/documentation improvements from recent approved PRs

Impact

• Improves developer workflow by catching config syntax errors earlier
• Keeps master aligned with the latest approved work on dev
• Includes both feature and docs updates; no breaking interface changes expected

Validation

• Changes were previously reviewed and approved in upstream PRs before merge to dev
• CI checks passed on merged PRs targeting dev
• Lint command behavior validated for success and failure paths in tests