Implement safety barriers and enhance documentation

Author: N0tHorizon

CHANGELOG.md

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+# Changelog
+
+All notable changes to Windows Telemetry Blocker are documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+---
+
+## [0.9] - 2026-01-24
+
+### Added
+- **Safety Barriers System**: Comprehensive interrupt handling and recovery
+  - Global state tracking for critical operations
+  - Interrupt handler (trap) for Ctrl+C graceful shutdown
+  - Cleanup task queue system with LIFO execution order
+  - Emergency rollback procedures
+  - Partial execution detection on launcher restart
+  - State recovery and user guidance
+
+- **Enhanced Run.bat Launcher** (v1.0)
+  - Execution state file tracking across sessions
+  - Incomplete execution detection on startup
+  - Recovery options (rollback, continue, exit)
+  - Separate safety event logging
+  - Confirmation prompts for destructive operations
+  - Double confirmation for critical operations
+  - Error code tracking and persistence
+
+- **Execution State Management**
+  - Global operation tracking in PowerShell
+  - Partial execution state storage
+  - Removed apps tracking
+  - Duration and error recording
+  - Automatic cleanup task queuing
+
+- **Enhanced Logging**
+  - Separate safety event log (telemetry-blocker-safety.log)
+  - Execution state persistence
+  - Timestamp tracking for all operations
+  - Error code logging
+  - Session start/end markers
+
+- **Apps Module Safety**
+  - Removed apps tracking in global state
+  - Interruption detection during removal
+  - Removal count in completion messages
+  - User guidance for manual reinstallation
+
+- **System Restore Point Safety**
+  - Wrapped in critical operation handler
+  - Automatic cleanup task registration
+  - Graceful failure handling
+  - User notification of restore point availability
+
+- **Documentation**
+  - SAFETY_BARRIERS.md - Complete safety system documentation
+  - Recovery procedures for all scenarios
+  - Emergency manual recovery procedures
+  - Testing recommendations
+  - Configuration guide
+
+### Fixed
+- **Issue #18**: Fixed "param not recognized" error in apps.ps1
+  - Moved param() block to correct position (after comments, before dot-source)
+  - Verified other modules have correct param() placement
+
+- **PowerShell Path Handling**
+  - Added quotes around %PS_EXE% in all invocations
+  - Handles paths with spaces (e.g., C:\Program Files)
+  - Tested with custom PowerShell installations
+
+- **Admin Elevation**
+  - Proper elevation flow before operations
+  - Clear UAC prompt messaging
+  - Elevation state verification
+
+### Changed
+- Version strings updated to 0.9 (production ready)
+- Removed "pending release" notes
+- Updated launcher to v1.0 (matches 0.9 release)
+- Menu descriptions enhanced with safety information
+- Error messages include recovery guidance
+- Log messages include operation context
+
+### Security
+- Safety barriers protect against interruption during operations
+- State recovery prevents partial modification corruption
+- Emergency cleanup ensures system consistency
+- Registry backups available for all changes
+- System restore points created before modifications
+
+### Documentation Updates
+- RELEASE_NOTES.md - Comprehensive v0.9 release documentation
+- SAFETY_BARRIERS.md - Complete implementation guide
+- README.md - Enhanced with feature descriptions
+- CHANGELOG.md - This file (new)
+
+---
+
+## [0.8] - Pre-Release (Development)
+
+### Features
+- Core telemetry blocking functionality
+- Service disabling and management
+- App removal capabilities
+- Rollback system for most modules
+- Logging and reporting
+- DryRun/WhatIf testing mode
+- Module selection system
+- Registry backup
+- Auto-update capability
+
+### Notes
+- Pre-release version used for development and testing
+- Not recommended for production use
+- All features present but safety barriers incomplete
+- Documentation partial
+
+---
+
+## Legend
+
+- **Added**: New features
+- **Changed**: Changes in existing functionality
+- **Deprecated**: Soon-to-be removed features
+- **Removed**: Removed features
+- **Fixed**: Bug fixes
+- **Security**: Security-related changes
+- **Documentation**: Documentation improvements
+
+---
+
+## Versioning Scheme
+
+This project follows Semantic Versioning (MAJOR.MINOR.PATCH):
+- **MAJOR** (0): Significant releases, major feature additions
+- **MINOR** (9): Feature completeness, safety additions
+- **PATCH** (0): Bug fixes, minor improvements
+
+---
+
+## How to Report Issues
+
+Found a bug or have a suggestion? Please report it:
+1. Check existing [Issues](https://github.com/N0tHorizon/WindowsTelemetryBlocker/issues)
+2. Create a new issue with detailed description
+3. Include logs from execution
+4. Specify Windows version and PowerShell version
+5. Mention steps to reproduce
+
+---
+
+## Development
+
+For development roadmap and planned features, see [RELEASE_NOTES.md](RELEASE_NOTES.md) future roadmap section.
+
+---
+
+**Last Updated**: 2026-01-24  
+**Current Version**: 0.9