Rebrand all user-visible BTerminal references to Agent Orchestrator
(window title, product name, identifier, status bar, updater URL,
context registration, CLAUDE.md branch reference).
Fix critical btmsg/bttask crash: pragma_update uses execute() internally
but PRAGMA busy_timeout returns a result row, causing "Execute returned
results" error that silently broke all CommsTab message loading.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>