feat(iec61131): add static analysis module with CFG, complexity, and nesting depth calculations

- Introduced `analysis::cfg` for Control Flow Graph construction and analysis.
- Added functions for cyclomatic complexity calculations and nesting depth analysis.
- Enhanced documentation with examples for new analysis features.

BREAKING CHANGE: Updated `plceye` to migrate from `iecst` to `iec61131` v0.7.0 for ST parsing and analysis, improving error reporting and language support.

fix(plceye): adapt analysis modules to use new AST structure from `iec61131`

- Updated references in `l5x_analysis`, `st_parsing`, and `complexity` modules to use the new `iec61131` analysis functions.
- Maintained backward compatibility for existing rules and detectors.

chore(iec61131): update version to 0.7.0 and enhance crate description

- Updated `Cargo.toml` to reflect new version and added static analysis capabilities.
- Improved changelog with detailed descriptions of new features and changes.

Author: radevgit

Cargo.lock

@@ -1,7 +1,24 @@
 # Changelog
 
+## 0.7.0 (2025-12-11)
+
+### Added
+- **Static analysis module** - Complete analysis capabilities for PLC code
+  - `analysis::cfg` - Control Flow Graph (CFG) construction and analysis
+    - `CfgBuilder` - build CFG from AST statements
+    - `Cfg` - graph structure with cyclomatic complexity calculation
+    - `cyclomatic_complexity()` - calculate code complexity
+    - `cyclomatic_complexity_decisions()` - alternative calculation using decision points
+    - `to_dot()` - export to Graphviz format for visualization
+  - `analysis::nesting` - Nesting depth analysis
+    - `max_nesting_depth()` - calculate maximum control structure nesting
+  - `count_expression_decisions()` - count AND/OR decisions in expressions
+
+### Changed
+- Updated exports to include `Variable`, `Argument`, and `StatementList`
+- Enhanced documentation with analysis examples
+
 ## 0.6.1 (2025-12-11)
-- parser analysis added
 - parser security added
 
 ## 0.6.0 (2025-12-11)

iec61131/CHANGELOG.md

@@ -1,8 +1,8 @@
 [package]
 name = "iec61131"
-version = "0.6.1"
+version = "0.7.0"
 edition = "2021"
-description = "Complete IEC 61131-3 parser for all 5 PLC programming languages"
+description = "Complete IEC 61131-3 parser for all 5 PLC programming languages with static analysis"
 license = "MIT"
 repository = "https://github.com/radevgit/plc"
 homepage = "https://github.com/radevgit/plc"