Add six new slash command categories with useful developer tools

- Add /documentation category with create-readme-section command
- Add /security category with security-audit and check-best-practices commands
- Add /architecture category with explain-architecture-pattern command
- Add /promptengineering category with convert-to-test-driven-prompt and batch-operations-prompt commands
- Update README.md to document all new slash commands
- Add Bash(mkdir:*) permission to settings.local.json

.claude/commands/promptengineering/batch-operations-prompt.md

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+# Batch Operations Prompt
+
+Optimize prompts for multiple file operations, parallel processing, and efficient bulk changes across a codebase. This helps Claude Code work more efficiently with TodoWrite patterns.
+
+## Usage Examples
+
+### Basic Usage
+"Convert to batch: Update all test files to use new API"
+"Batch prompt for: Rename variable across multiple files"
+"Optimize for parallel: Add logging to all service files"
+
+### Complex Operations
+"Batch refactor: Convert callbacks to async/await in all files"
+"Parallel update: Add TypeScript types to all components"
+"Bulk operation: Update import statements across the project"
+
+## Instructions for Claude
+
+When creating batch operation prompts:
+
+1. **Identify Parallelizable Tasks**: Determine what can be done simultaneously
+2. **Group Related Operations**: Organize tasks by type and dependency
+3. **Create Efficient Sequences**: Order operations to minimize conflicts
+4. **Use TodoWrite Format**: Structure for Claude's task management
+5. **Include Validation Steps**: Add checks between batch operations
+
+### Batch Prompt Structure
+
+#### 1. Overview
+- Scope of changes
+- Files/patterns affected
+- Expected outcome
+
+#### 2. Prerequisite Checks
+- Required tools/dependencies
+- Initial validation commands
+- Backup recommendations
+
+#### 3. Parallel Operations
+- Independent tasks that can run simultaneously
+- File groups that don't conflict
+- Read operations for gathering information
+
+#### 4. Sequential Operations
+- Tasks with dependencies
+- Operations that modify same files
+- Final validation steps
+
+### Optimization Strategies
+
+#### File Grouping
+```markdown
+## Batch Operation: [Operation Name]
+
+### Phase 1: Analysis (Parallel)
+- Search for all affected files using Glob/Grep
+- Read current implementations
+- Identify patterns and dependencies
+
+### Phase 2: Implementation (Grouped)
+Group A (Independent files):
+- File1.js: [specific change]
+- File2.js: [specific change]
+
+Group B (Related components):
+- Component1.tsx: [change]
+- Component1.test.tsx: [related change]
+
+### Phase 3: Validation (Sequential)
+1. Run linter on modified files
+2. Execute test suite
+3. Build verification
+```
+
+#### TodoWrite Integration
+```markdown
+### Task List Structure
+1. Gather information (can parallelize):
+   - Find all files matching pattern X
+   - Read configuration files
+   - Check current implementations
+
+2. Batch updates (group by conflict potential):
+   - Update non-conflicting files (parallel)
+   - Update shared modules (sequential)
+   - Update test files (parallel)
+
+3. Verification (sequential):
+   - Run type checking
+   - Execute tests
+   - Validate build
+```
+
+### Conversion Examples
+
+#### Original Request:
+"Update all API calls to use the new authentication header"
+
+#### Batch-Optimized Version:
+```markdown
+## Batch Operation: Update API Authentication Headers
+
+### Prerequisites
+- Verify new auth header format
+- Check all API call patterns in codebase
+
+### Parallel Phase 1: Discovery
+Execute simultaneously:
+1. Grep for "fetch(" patterns
+2. Grep for "axios." patterns
+3. Grep for "api." patterns
+4. Read auth configuration file
+
+### Parallel Phase 2: Read Current Implementations
+Read all files containing API calls (batch read):
+- src/services/*.js
+- src/api/*.js
+- src/utils/api*.js
+
+### Sequential Phase 3: Update by Pattern Type
+Group 1 - Fetch calls:
+- Update all fetch() calls with new header
+- Pattern: Add "Authorization: Bearer ${token}"
+
+Group 2 - Axios calls:
+- Update axios config/interceptors
+- Update individual axios calls
+
+Group 3 - Custom API wrappers:
+- Update wrapper functions
+- Ensure backward compatibility
+
+### Parallel Phase 4: Update Tests
+Simultaneously update:
+- Unit tests mocking API calls
+- Integration tests with auth
+- E2E test auth setup
+
+### Sequential Phase 5: Validation
+1. ESLint all modified files
+2. Run test suite
+3. Test one API call manually
+4. Build project
+```
+
+### Output Format
+
+Generate batch prompt as:
+
+```markdown
+## Batch Operation Prompt: [Operation Name]
+
+### Efficiency Metrics
+- Estimated sequential time: X operations
+- Optimized parallel time: Y operations
+- Parallelization factor: X/Y
+
+### Execution Plan
+
+#### Stage 1: Information Gathering (Parallel)
+```bash
+# Commands that can run simultaneously
+[command 1] &
+[command 2] &
+[command 3] &
+wait
+```
+
+#### Stage 2: Bulk Operations (Grouped)
+**Parallel Group A:**
+- Files: [list]
+- Operation: [description]
+- No conflicts with other groups
+
+**Sequential Group B:**
+- Files: [list]
+- Operation: [description]
+- Must complete before Group C
+
+#### Stage 3: Verification (Sequential)
+1. [Verification step 1]
+2. [Verification step 2]
+3. [Final validation]
+
+### TodoWrite Task List
+- [ ] Complete Stage 1 analysis (parallel)
+- [ ] Execute Group A updates (parallel)
+- [ ] Execute Group B updates (sequential)
+- [ ] Run verification suite
+- [ ] Document changes
+```
+
+Remember to:
+- Maximize parallel operations
+- Group by conflict potential
+- Use TodoWrite's in_progress limitation wisely
+- Include rollback strategies
+- Provide specific file patterns