add-source

Wire a new agent-CLI Source adapter into pixtuoid (a new coding CLI whose sessions become office sprites). Use when the user says 'add support for <CLI>', 'add a source for <tool>', or 'integrate <agent CLI>'. Orchestrates the cross-crate checklist whose steps have TEST TEETH — the ones a diff-scoped edit silently misses (site manifest bridge, per-source badge hue, home-dir fn, plus the two pixtuoid/tests/*…