fix(shell): address shellcheck warnings, standardize error handling, add retry logic

- Fix shellcheck SC2155 (separate variable assignment from declaration)
- Replace ! bool && bool pattern with [ "$bool" = true ] && [ "$bool2" = true ]
- Add retry logic for git clone with configurable attempts
- Add retry logic for opencode session fork
- Add NETWORK_RETRY_ATTEMPTS and NETWORK_RETRY_DELAY_SECONDS config vars
- Add retry_with_backoff helper function in kugetsu-config.sh
- Replace subshell cd with git -C for safer directory handling

skills/kugetsu/scripts/kugetsu-config.sh

@@ -26,6 +26,9 @@ QUEUE_DAEMON_INTERVAL_MINUTES="${QUEUE_DAEMON_INTERVAL_MINUTES:-5}"
 QUEUE_CLEANUP_AGE_DAYS="${QUEUE_CLEANUP_AGE_DAYS:-7}"
 TASK_TIMEOUT_HOURS="${TASK_TIMEOUT_HOURS:-1}"
 
+NETWORK_RETRY_ATTEMPTS="${NETWORK_RETRY_ATTEMPTS:-3}"
+NETWORK_RETRY_DELAY_SECONDS="${NETWORK_RETRY_DELAY_SECONDS:-5}"
+
 # Load user config overrides (~/.kugetsu/config)
 if [ -f "$KUGETSU_DIR/config" ]; then
     source "$KUGETSU_DIR/config"
@@ -87,3 +90,24 @@ set_debug_mode() {
     
     echo "${filtered_args[@]}"
 }
+
+retry_with_backoff() {
+    local max_attempts="${1:-$NETWORK_RETRY_ATTEMPTS}"
+    local delay_seconds="${2:-$NETWORK_RETRY_DELAY_SECONDS}"
+    local command="$3"
+    local remaining_attempts=$max_attempts
+    
+    while [ $remaining_attempts -gt 0 ]; do
+        if eval "$command"; then
+            return 0
+        fi
+        remaining_attempts=$((remaining_attempts - 1))
+        if [ $remaining_attempts -gt 0 ]; then
+            log "warn" "retry_with_backoff" "Command failed, $remaining_attempts retries remaining. Waiting ${delay_seconds}s..."
+            sleep "$delay_seconds"
+            delay_seconds=$((delay_seconds * 2))
+        fi
+    done
+    log "error" "retry_with_backoff" "Command failed after $max_attempts attempts"
+    return 1
+}

skills/kugetsu/scripts/kugetsu-session.sh

@@ -13,7 +13,8 @@ count_active_dev_sessions() {
     if [ -d "$SESSIONS_DIR" ]; then
         for session_file in "$SESSIONS_DIR"/*.json; do
             if [ -f "$session_file" ]; then
-                local filename=$(basename "$session_file")
+                local filename
+                filename=$(basename "$session_file")
                 if [ "$filename" != "base.json" ] && [ "$filename" != "pm-agent.json" ]; then
                     count=$((count + 1))
                 fi
@@ -239,18 +240,39 @@ create_session() {
         return 1
     fi
     
-    local before_file="$KUGETSU_DIR/sessions/before$$.json"
-    local after_file="$KUGETSU_DIR/sessions/after$$.json"
+    local before_file
+    before_file="$KUGETSU_DIR/sessions/before$$.json"
+    local after_file
+    after_file="$KUGETSU_DIR/sessions/after$$.json"
     
     opencode session list --format=json > "$before_file" 2>/dev/null || printf '{}' > "$before_file"
     
-    opencode run --fork --session "$base_session" "new session" >/dev/null 2>&1
+    local fork_success=false
+    local attempt=0
+    local max_attempts="${NETWORK_RETRY_ATTEMPTS:-3}"
+    
+    while [ $attempt -lt $max_attempts ] && [ "$fork_success" = false ]; do
+        attempt=$((attempt + 1))
+        if opencode run --fork --session "$base_session" "new session" >/dev/null 2>&1; then
+            fork_success=true
+        elif [ $attempt -lt $max_attempts ]; then
+            log "warn" "create_session" "Fork attempt $attempt failed, retrying..."
+            sleep "$((attempt * 2))"
+        fi
+    done
+    
+    if [ "$fork_success" = false ]; then
+        log "error" "create_session" "Failed to fork session after $max_attempts attempts"
+        rm -f "$before_file" "$after_file"
+        return 1
+    fi
     
     sleep 1
     
     opencode session list --format=json > "$after_file" 2>/dev/null || printf '{}' > "$after_file"
     
-    local new_session_id=$(python3 << PYEOF
+    local new_session_id
+    new_session_id=$(python3 << PYEOF
 import json
 
 with open("$before_file", 'r') as f:
@@ -389,20 +411,20 @@ ensure_session() {
         session_exists=true
     fi
     
-    if $worktree_exists && $session_exists; then
+    if [ "$worktree_exists" = true ] && [ "$session_exists" = true ]; then
         log "info" "ensure_session" "Session already exists for $issue_ref"
         echo "continued"
         return 0
     fi
     
-    if ! $worktree_exists && $session_exists; then
+    if [ "$worktree_exists" = false ] && [ "$session_exists" = true ]; then
         log "warn" "ensure_session" "Session exists but worktree is missing. Removing stale session..."
         rm -f "$session_path"
         remove_issue_from_index "$issue_ref"
         session_exists=false
     fi
     
-    if ! $worktree_exists; then
+    if [ "$worktree_exists" = false ]; then
         local wt_status=$(ensure_worktree "$issue_ref")
         if [ "$wt_status" != "created" ] && [ "$wt_status" != "existed" ]; then
             log "error" "ensure_session" "Failed to ensure worktree for $issue_ref"

skills/kugetsu/scripts/kugetsu-worktree.sh

@@ -76,7 +76,8 @@ create_worktree() {
         exit 1
     fi
     
-    local worktree_parent_dir=$(dirname "$worktree_path")
+    local worktree_parent_dir
+    worktree_parent_dir=$(dirname "$worktree_path")
     mkdir -p "$worktree_parent_dir"
     
     if worktree_exists "$issue_ref" "$parent_dir"; then
@@ -85,15 +86,36 @@ create_worktree() {
     fi
     
     echo "Creating worktree at '$worktree_path'..."
-    git clone "$repo_url" "$worktree_path" 2>/dev/null || {
-        echo "Error: Failed to clone repository" >&2
+    
+    local clone_success=false
+    local attempt=0
+    local max_attempts="${NETWORK_RETRY_ATTEMPTS:-3}"
+    
+    while [ $attempt -lt $max_attempts ] && [ "$clone_success" = false ]; do
+        attempt=$((attempt + 1))
+        if [ $attempt -gt 1 ]; then
+            echo "Clone attempt $attempt of $max_attempts..."
+            sleep "$((attempt * 2))"
+        fi
+        
+        if git clone "$repo_url" "$worktree_path" 2>/dev/null; then
+            clone_success=true
+        fi
+    done
+    
+    if [ "$clone_success" = false ]; then
+        echo "Error: Failed to clone repository after $max_attempts attempts" >&2
         exit 1
-    }
+    fi
     
     echo "Creating branch '$branch_name'..."
-    (cd "$worktree_path" && git checkout -b "$branch_name" origin/main 2>/dev/null || git checkout -b "$branch_name" main 2>/dev/null) || {
+    if git -C "$worktree_path" checkout -b "$branch_name" origin/main 2>/dev/null; then
+        :
+    elif git -C "$worktree_path" checkout -b "$branch_name" main 2>/dev/null; then
+        :
+    else
         echo "Warning: Could not checkout branch (may need to run from within worktree after session)" >&2
-    }
+    fi
     
     echo "Worktree created at: $worktree_path"
 }