README: rewritten to reflect actual Option B architecture (Electron on
host, agents in container), correct start.sh usage, bin/claude routing,
and portability. Remove outdated manual docker run instructions.
HANDOVER.md: documents all fixes made this session, what is unverified,
what still needs testing (claude-code check, localhost:null, network),
and key architecture facts for the next session.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
