Implement Soroban contract analysis and reporting tools

[abdulrcrtw]

Summary

Closes #468 — Soroban Rule Coverage Report

• Coverage reporter with per-rule and per-category breakdowns
• Markdown report generator
• Configurable minimum coverage thresholds

Closes #458 — Soroban Contract Complexity Analyzer

• Cyclomatic and cognitive complexity calculation
• Risk level classification (low/medium/high/critical)
• Functions analysis with recommendations

Closes #457 — Soroban Security Baseline Profile

• 6 built-in security checks: authorization, input validation, storage safety, panic usage, unwrap usage, integer safety
• Custom check support via configuration
• Severity scoring and reporting

Closes #456 — Soroban Contract Dependency Scanner

• Dependency extraction from use/mod declarations
• Unused dependency detection
• Circular dependency detection via DFS
• Edges graph generation

Verification

Each module includes comprehensive Jest test suites.

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