v4.2.0: Technical debt hotspots and CLI architecture cleanup

Added

• skylos debt <path> for technical debt hotspot analysis
• separate structural debt scoring and hotspot priority_score

Changed

• CLI entrypoint cleanup by extracting command handlers into dedicated modules

• CLI helper extraction and rules command extraction

• agent ranking and payload helpers extracted out of agent_center.py

• skylos debt --top now overrides report.top

• changed-file debt scans now resolve git diffs from the repository root and include .js / .jsx

• debt baseline and history writes now require project-root scans

• debt baseline comparisons no longer count unseen hotspots as resolved

  Fixed

• skylos agent watch --learn now forwards learning flag into the watch loop

• parity test isolation improvements to avoid suite-state drift