chore: bump version to 2.1.0 across all components

[shivasurya]

Summary

• Bump version to 2.1.0 across sast-engine, python-sdk, server.json, workflows, and README
• Add CHANGELOG entry for 2.1.0 (Python SDK module migration + 22 Go security rules)

Files Changed

• sast-engine/VERSION — 2.0.2 → 2.1.0
• sast-engine/cmd/root.go — 2.0.2 → 2.1.0
• sast-engine/mcp/types_test.go — 2.0.2 → 2.1.0
• python-sdk/pyproject.toml — 2.0.2 → 2.1.0
• python-sdk/codepathfinder/__init__.py — 2.0.1 → 2.1.0
• python-sdk/CHANGELOG.md — add [2.1.0] entry
• server.json — 2.0.2 → 2.1.0
• .github/workflows/deploy-sandbox.yml — 2.0.2 → 2.1.0
• README.md — v2.0.2 → v2.1.0

Test plan

• All Go tests pass (go test ./...)
• sast-engine/mcp/types_test.go version assertion updated

🤖 Generated with Claude Code

[safedep]

SafeDep Report Summary

No dependency changes detected. Nothing to scan.

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_{This report is generated by SafeDep Github App}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.94%. Comparing base (232198b) to head (45abf4c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #659      +/-   ##
==========================================
+ Coverage   84.93%   84.94%   +0.01%     
==========================================
  Files         172      172              
  Lines       24882    24882              
==========================================
+ Hits        21133    21136       +3     
+ Misses       2962     2959       -3     
  Partials      787      787              

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