feat: optimize docs workflow and add gitignore support to scripts

Major Changes:
1. Add classify-folders.sh script
   - Extract folder classification logic from inline script
   - Support for code/navigation/skip folder types
   - Placed in .claude/scripts/ for reusability

2. Optimize /workflow:docs command (docs.md)
   - Simplify Phase 1: single-step session initialization
   - Add Path Mirroring Strategy section
   - Document structure now mirrors source structure
   - Update to single config.json file (replace multiple .process files)
   - Fix path detection for Windows/Git Bash compatibility
   - Update all task templates with mirrored output paths

3. Add parent .gitignore support
   - detect_changed_modules.sh: parse .gitignore from current or git root
   - update_module_claude.sh: respect .gitignore patterns when counting files
   - Unified build_exclusion_filters() function across scripts

Key Improvements:
- Documentation output: .workflow/docs/ with project structure mirroring
- Session init: 4 steps → 1 bash command block
- Config files: multiple files → single config.json
- Path detection: improved Windows/Git Bash normalization
- Gitignore support: current dir → parent dir fallback

Related Issue: Fix core directory exclusion in get_modules_by_depth.sh
(Note: get_modules_by_depth.sh is in user global config, not in this repo)

.claude/scripts/update_module_claude.sh

@@ -4,29 +4,85 @@
 #   module_path: Path to the module directory
 #   update_type: full|related (default: full)
 #   tool: gemini|qwen|codex (default: gemini)
-#   Script automatically detects layer depth and selects appropriate template
+#
+# Features:
+# - Respects .gitignore patterns (current directory or git root)
+# - Automatic layer detection (Root/Domain/Module/Sub-Module)
+# - Template-based documentation generation
+
+# Build exclusion filters from .gitignore
+build_exclusion_filters() {
+    local filters=""
+
+    # Common system/cache directories to exclude
+    local system_excludes=(
+        ".git" "__pycache__" "node_modules" ".venv" "venv" "env"
+        "dist" "build" ".cache" ".pytest_cache" ".mypy_cache"
+        "coverage" ".nyc_output" "logs" "tmp" "temp"
+    )
+
+    for exclude in "${system_excludes[@]}"; do
+        filters+=" -not -path '*/$exclude' -not -path '*/$exclude/*'"
+    done
+
+    # Find and parse .gitignore (current dir first, then git root)
+    local gitignore_file=""
+
+    # Check current directory first
+    if [ -f ".gitignore" ]; then
+        gitignore_file=".gitignore"
+    else
+        # Try to find git root and check for .gitignore there
+        local git_root=$(git rev-parse --show-toplevel 2>/dev/null)
+        if [ -n "$git_root" ] && [ -f "$git_root/.gitignore" ]; then
+            gitignore_file="$git_root/.gitignore"
+        fi
+    fi
+
+    # Parse .gitignore if found
+    if [ -n "$gitignore_file" ]; then
+        while IFS= read -r line; do
+            # Skip empty lines and comments
+            [[ -z "$line" || "$line" =~ ^[[:space:]]*# ]] && continue
+
+            # Remove trailing slash and whitespace
+            line=$(echo "$line" | sed 's|/$||' | xargs)
+
+            # Skip wildcards patterns (too complex for simple find)
+            [[ "$line" =~ \* ]] && continue
+
+            # Add to filters
+            filters+=" -not -path '*/$line' -not -path '*/$line/*'"
+        done < "$gitignore_file"
+    fi
+
+    echo "$filters"
+}
 
 update_module_claude() {
     local module_path="$1"
     local update_type="${2:-full}"
     local tool="${3:-gemini}"
-    
+
     # Validate parameters
     if [ -z "$module_path" ]; then
         echo "❌ Error: Module path is required"
         echo "Usage: update_module_claude.sh <module_path> [update_type]"
         return 1
     fi
-    
+
     if [ ! -d "$module_path" ]; then
         echo "❌ Error: Directory '$module_path' does not exist"
         return 1
     fi
-    
-    # Check if directory has files
-    local file_count=$(find "$module_path" -maxdepth 1 -type f 2>/dev/null | wc -l)
+
+    # Build exclusion filters from .gitignore
+    local exclusion_filters=$(build_exclusion_filters)
+
+    # Check if directory has files (excluding gitignored paths)
+    local file_count=$(eval "find \"$module_path\" -maxdepth 1 -type f $exclusion_filters 2>/dev/null" | wc -l)
     if [ $file_count -eq 0 ]; then
-        echo "⚠️  Skipping '$module_path' - no files found"
+        echo "⚠️  Skipping '$module_path' - no files found (after .gitignore filtering)"
         return 0
     fi