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/classify-folders.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+# Classify folders by type for documentation generation
+# Usage: get_modules_by_depth.sh | classify-folders.sh
+# Output: folder_path|folder_type|code:N|dirs:N
+
+while IFS='|' read -r depth_info path_info files_info types_info claude_info; do
+  # Extract folder path from format "path:./src/modules"
+  folder_path=$(echo "$path_info" | cut -d':' -f2-)
+
+  # Skip if path extraction failed
+  [[ -z "$folder_path" || ! -d "$folder_path" ]] && continue
+
+  # Count code files (maxdepth 1)
+  code_files=$(find "$folder_path" -maxdepth 1 -type f \
+    \( -name "*.ts" -o -name "*.tsx" -o -name "*.js" -o -name "*.jsx" \
+       -o -name "*.py" -o -name "*.go" -o -name "*.java" -o -name "*.rs" \
+       -o -name "*.c" -o -name "*.cpp" -o -name "*.cs" \) \
+    2>/dev/null | wc -l)
+
+  # Count subdirectories
+  subfolders=$(find "$folder_path" -maxdepth 1 -type d \
+    -not -path "$folder_path" 2>/dev/null | wc -l)
+
+  # Determine folder type
+  if [[ $code_files -gt 0 ]]; then
+    folder_type="code"  # API.md + README.md
+  elif [[ $subfolders -gt 0 ]]; then
+    folder_type="navigation"  # README.md only
+  else
+    folder_type="skip"  # Empty or no relevant content
+  fi
+
+  # Output classification result
+  echo "${folder_path}|${folder_type}|code:${code_files}|dirs:${subfolders}"
+done