## Problem
The deacon patrol was leaking claude processes. Every patrol cycle (1-3 minutes),
a new claude process was spawned under the hq-deacon tmux session, but old processes
were never terminated. This resulted in 12+ accumulated claude processes consuming
resources.
## Root Cause
In molecule_step.go:331, handleStepContinue() used tmux respawn-pane -k to restart
the pane between patrol steps. The -k flag sends SIGHUP to the shell but does not
kill all descendant processes (claude and its node children).
## Solution
Added KillPaneProcesses() function in tmux.go that explicitly kills all descendant
processes before respawning the pane. This function:
- Gets all descendant PIDs recursively
- Sends SIGTERM to all (deepest first)
- Waits 100ms for graceful shutdown
- Sends SIGKILL to survivors
Updated handleStepContinue() to call KillPaneProcesses() before RespawnPane().
Co-authored-by: Roland Tritsch <roland@ailtir.com>
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
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