feat(mirror): implement AST-based cyclomatic complexity checker in co…

[borjamoskv]

Summary

Implements the TODO at cortex-core/mirror_audit.py line 59:

# TODO: Add cyclomatic complexity check in v6.5

Creates cortex/audit/mirror_audit.py with a full AST-based cyclomatic complexity checker.

What's included

• measure_cyclomatic_complexity(node) — pure-AST McCabe scorer (If/For/While/ExceptHandler/With/Assert/comprehension/BoolOp/IfExp/Match)
• scan_file(path) — iterator that yields ComplexityResult per function; graceful on SyntaxError/OSError
• run_complexity_audit(root, ...) — recursive .py scanner with configurable thresholds and exclude-dirs
• ComplexityStatus (PASS/WARN/FAIL), ComplexityResult, ComplexityReport dataclasses
• CLI entry-point: python -m cortex.audit.mirror_audit [root]

Thresholds

Range	Status
≤ 10	PASS
11–20	WARN
> 20	FAIL

All output goes through logging — zero bare print() calls in production paths.

Closes #396

[github-actions]

∞ MÖBIUS — PR Analysis

Metric	Value
Files changed	1
Total changes	283 (+/-)
Complexity	high
Est. review time	30 min
Has tests?	⚠️ Missing
Has Rust changes?	No

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No test files detected in this PR. Consider adding tests.

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