Improve performance and process handling

lib/clean/caches.sh

@@ -241,7 +241,25 @@ clean_project_caches() {
     # 4. Clean up any stuck processes
     for pid in $next_pid $py_pid; do
         if kill -0 "$pid" 2> /dev/null; then
+            # Send TERM signal first
             kill -TERM "$pid" 2> /dev/null || true
+
+            # Wait up to 2 seconds for graceful termination
+            local grace_period=0
+            while [[ $grace_period -lt 20 ]]; do
+                if ! kill -0 "$pid" 2> /dev/null; then
+                    break
+                fi
+                sleep 0.1
+                ((grace_period++))
+            done
+
+            # Force kill if still running
+            if kill -0 "$pid" 2> /dev/null; then
+                kill -KILL "$pid" 2> /dev/null || true
+            fi
+
+            # Final wait (should be instant now)
             wait "$pid" 2> /dev/null || true
         else
             wait "$pid" 2> /dev/null || true

lib/clean/dev.sh

@@ -321,12 +321,25 @@ clean_dev_network() {
     safe_clean ~/Library/Caches/wget/* "macOS wget cache"
 }
 
+# Clean orphaned SQLite temporary files (-shm and -wal files)
+# Strategy: Only clean truly orphaned temp files where base database is missing
+# This is fast and safe - skip complex checks for files with existing base DB
+# Env: DRY_RUN
+clean_sqlite_temp_files() {
+    # Skip this cleanup due to low ROI (收益比低，经常没东西可清理)
+    # Find scan is still slow even optimized, and orphaned files are rare
+    return 0
+}
+
 # Main developer tools cleanup function
 # Calls all specialized cleanup functions
 # Env: DRY_RUN
 clean_developer_tools() {
     stop_section_spinner
 
+    # Clean SQLite temporary files first
+    clean_sqlite_temp_files
+
     clean_dev_npm
     clean_dev_python
     clean_dev_go

lib/clean/user.sh

@@ -78,8 +78,9 @@ scan_external_volumes() {
     start_section_spinner "Scanning $volume_count external volume(s)..."
 
     for volume in "${candidate_volumes[@]}"; do
-        # Verify volume is actually mounted (reduced timeout from 2s to 1s)
-        run_with_timeout 1 mount | grep -q "on $volume " || continue
+        # Re-verify volume is still accessible (may have been unmounted since initial scan)
+        # Use simple directory check instead of slow mount command for better performance
+        [[ -d "$volume" && -r "$volume" ]] || continue
 
         # 1. Clean Trash on volume
         local volume_trash="$volume/.Trashes"

lib/core/file_ops.sh

@@ -185,13 +185,13 @@ safe_sudo_find_delete() {
     local age_days="${3:-7}"
     local type_filter="${4:-f}"
 
-    # Validate base directory
-    if [[ ! -d "$base_dir" ]]; then
-        log_error "Directory does not exist: $base_dir"
-        return 1
+    # Validate base directory (use sudo for permission-restricted dirs)
+    if ! sudo test -d "$base_dir" 2>/dev/null; then
+        debug_log "Directory does not exist (skipping): $base_dir"
+        return 0
     fi
 
-    if [[ -L "$base_dir" ]]; then
+    if sudo test -L "$base_dir" 2>/dev/null; then
         log_error "Refusing to search symlinked directory: $base_dir"
         return 1
     fi