Agent sessions would fail on startup because send-keys arrived before the
shell was ready, causing 'bad pattern' and 'command not found' errors.
Fix: Create sessions with the command directly using tmux new-session's
command argument. This runs the agent as the pane's initial process,
avoiding shell readiness timing issues entirely.
Updated all agent managers: mayor, deacon, witness, refinery, polecat, crew.
Also fixes pre-existing build error in polecat/manager.go (polecatPath →
clonePath/newClonePath).
Closes#280
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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