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CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Security module (`security.py`) with path traversal protection and command injection prevention
+- Centralized configuration (`config.py`) with environment variable support
+- `.env.example` for environment variable documentation
+- Path validation for all file operations (`drawing_open`, `drawing_save`, `drawing_export_*`)
+- Command sanitization for `system_run_command` and `system_run_lisp`
+- Ruff linting configuration in `pyproject.toml`
+- Pre-commit hooks (`.pre-commit-config.yaml`) for automated code quality
+- pytest-cov for test coverage reporting
+- Comprehensive test suite: 95 tests across 7 test files
+  - `test_entity_creation.py` — 13 entity creation tests
+  - `test_drawing.py` — 8 drawing operation tests
+  - `test_dimensions.py` — 5 dimension tests
+  - `test_layer_block.py` — 12 layer and block tests
+  - `test_analysis.py` — 12 analysis and modification tests
+  - `test_security.py` — 29 security tests
+- GitHub Actions CI workflow (lint + test on Python 3.11/3.12)
+- README.md with full documentation
+- CHANGELOG.md
+- `.gitignore`
+
+### Changed
+- All silent `except Exception: pass` blocks now include logging
+- Removed unused imports across all source files
+- Renamed ambiguous variable `l` to `lyr` in layer iteration code
+- Import sorting organized with ruff isort rules
+
+### Fixed
+- `_detect_autocad_running` now logs detection failures instead of silently swallowing them
+- Resource functions now log errors before returning error JSON
+
+## [1.0.0] — 2026-03-01
+
+### Added
+- Initial release with 67 tools, 6 resources, 5 prompt templates
+- Dual-engine architecture: COM backend (live AutoCAD) + ezdxf backend (headless)
+- FastMCP 3.0 server with middleware stack (error handling, audit, timing, logging)
+- Drawing management: new, open, save, save-as, export DXF/PDF, purge, audit, undo/redo
+- Entity creation: line, circle, arc, polyline, rectangle, text, mtext, hatch, spline, ellipse, point, block reference
+- Dimensions: linear, aligned, angular, radius, diameter
+- Entity modification: move, copy, rotate, scale, mirror, offset, delete, rectangular/polar array
+- Layer management: create, delete, set current, modify, freeze/thaw, lock/unlock, hide/show, isolate
+- Block operations: list, insert, explode, attributes, create from entities, find references
+- Analysis: entity stats, region search, distance/area measurement, bounding box, select by layer/type
+- View control: zoom extents/window, screenshot
+- Transaction support: begin, commit, rollback
+- System tools: status, variables, command execution, AutoLISP evaluation
+- 5 prompt templates: floor plan, P&ID, electrical schematic, mechanical drawing, quick drawing