fix: cmd_start and cmd_continue now fork dev agent to work on task (issue #187)

- Added build_dev_agent_message() function to generate default workflow prompt
- cmd_start now forks the agent after creating session (fire-and-forget)
- cmd_continue now uses default message when empty and forks agent (fire-and-forget)
- Both commands log output to $LOGS_DIR/dev-$session_id.log

skills/kugetsu/scripts/kugetsu-session.sh

@@ -199,6 +199,45 @@ cmd_delegate() {
     echo "Delegated to PM agent (logged to $(basename "$log_file"))"
 }
 
+build_dev_agent_message() {
+    local issue_ref="$1"
+    local user_message="${2:-}"
+    
+    local instance=$(echo "$issue_ref" | cut -d'/' -f1 | cut -d'#' -f1)
+    local owner=$(echo "$issue_ref" | cut -d'/' -f2)
+    local repo=$(echo "$issue_ref" | cut -d'/' -f3 | cut -d'#' -f1)
+    local number=$(echo "$issue_ref" | grep -oE '#[0-9]+$' | tr -d '#')
+    local worktree_path=$(issue_ref_to_worktree_path "$issue_ref")
+    
+    local base_message="You are assigned to work on $issue_ref.
+
+Workflow:
+1. Read the issue at $instance/$owner/$repo/issues/$number AND all comments on that issue
+2. Check if a PR already exists for this issue
+   - If PR exists and is open, review it and learn from it
+   - If PR makes sense to continue, work on it instead
+   - If PR is not worth continuing, create a new branch/PR but explain in PR description why you're creating a new one instead of continuing the existing PR
+3. Read README.md (if exists) to understand the general concept of this repository
+4. Read CONTRIBUTING.md (if exists) to understand how to contribute
+   - If CONTRIBUTING.md doesn't exist, follow steps 5-9 as your guideline
+5. Explore the repository to understand the codebase
+6. If anything is unclear, post a comment on the issue asking for clarification before implementing
+7. Implement the solution
+8. Create a branch named fix/issue-$number and implement the fix
+9. Create a PR when the implementation is complete
+
+Work directory: $worktree_path"
+    
+    if [ -n "$user_message" ]; then
+        echo "$base_message
+
+Additional instructions from delegator:
+$user_message"
+    else
+        echo "$base_message"
+    fi
+}
+
 cmd_start() {
     local issue_ref="${1:-}"
     local message="${2:-}"
@@ -246,7 +285,7 @@ cmd_start() {
     local before_sessions=$(opencode session list 2>/dev/null | grep -oP '^ses_\w+' | sort)
     local before_set="|$before_sessions|"
     
-    create_worktree "$issue_ref"
+    create_worktree "$issue_ref" "$WORKTREES_DIR"
     
     local after_sessions=$(opencode session list 2>/dev/null | grep -oP '^ses_\w+' | sort)
     local new_session_id=""
@@ -270,6 +309,12 @@ cmd_start() {
     
     add_issue_to_index "$issue_ref" "$session_file"
     
+    local dev_message=$(build_dev_agent_message "$issue_ref" "$message")
+    
+    load_agent_env "dev"
+    
+    (cd "$worktree_path" && nohup sh -c "GITEA_TOKEN='$GITEA_TOKEN' opencode run '$dev_message' --continue --session '$new_session_id'" >> "$LOGS_DIR/dev-$new_session_id.log" 2>&1 &) && disown
+    
     echo "Session started for '$issue_ref': $new_session_id"
     echo "Worktree: $worktree_path"
 }
@@ -315,19 +360,16 @@ cmd_continue() {
     
     local opencode_session_id=$(python3 -c "import json; print(json.load(open('$session_path')).get('opencode_session_id', ''))" 2>/dev/null || echo "")
     local worktree_path=$(python3 -c "import json; print(json.load(open('$session_path')).get('worktree_path', ''))" 2>/dev/null || echo "")
+    local issue_ref=$(python3 -c "import json; print(json.load(open('$session_path')).get('issue_ref', ''))" 2>/dev/null || echo "")
+    
+    if [ -z "$message" ]; then
+        message=$(build_dev_agent_message "$issue_ref" "")
+    fi
     
     if [ -n "$worktree_path" ] && [ -d "$worktree_path" ]; then
-        if [ -n "$message" ]; then
-            (cd "$worktree_path" && opencode run "$message" --continue --session "$opencode_session_id" "$@")
-        else
-            (cd "$worktree_path" && opencode --continue --session "$opencode_session_id" "$@")
-        fi
+        (cd "$worktree_path" && nohup sh -c "GITEA_TOKEN='$GITEA_TOKEN' opencode run '$message' --continue --session '$opencode_session_id'" >> "$LOGS_DIR/dev-$opencode_session_id.log" 2>&1 &) && disown
     else
-        if [ -n "$message" ]; then
-            opencode run "$message" --continue --session "$opencode_session_id" "$@"
-        else
-            opencode --continue --session "$opencode_session_id" "$@"
-        fi
+        nohup sh -c "GITEA_TOKEN='$GITEA_TOKEN' opencode run '$message' --continue --session '$opencode_session_id'" >> "$LOGS_DIR/dev-$opencode_session_id.log" 2>&1 & && disown
     fi
 }