fix: session ID collision in cmd_start by excluding pm_agent_session_id

When cmd_start forks a new session, the session detection logic now
excludes both base_session_id AND pm_agent_session_id to prevent
forked sessions from being misidentified as the pm-agent session.

This addresses issue #81 where forked sessions were showing the same
session ID as the pm-agent.

skills/kugetsu/scripts/kugetsu

@@ -751,6 +751,10 @@ EOF
         pm_prompt="You are a PM (Project Manager) agent. Your role is to coordinate task delegation and review PRs. $pm_context"
     fi
     
+    # Set GIT_EDITOR to cat for non-interactive git operations (rebase, etc.)
+    export GIT_EDITOR=cat
+    export EDITOR=cat
+    
     opencode run "$pm_prompt" --fork --session "$new_session_id" 2>&1 || true
     
     local after_sessions=$(opencode session list 2>/dev/null | grep -oP '^ses_\w+' | sort)
@@ -848,7 +852,7 @@ cmd_start() {
     local after_sessions=$(opencode session list 2>/dev/null | grep -oP '^ses_\w+' | sort)
     local new_session_id=""
     while IFS= read -r sess; do
-        if [[ ! "$before_set" =~ \|${sess}\| ]] && [[ "$sess" != "$base_session_id" ]]; then
+        if [[ ! "$before_set" =~ \|${sess}\| ]] && [[ "$sess" != "$base_session_id" ]] && [[ "$sess" != "$pm_agent_session_id" ]]; then
             new_session_id="$sess"
             break
         fi