Validate MCP server compatibility across CodeQL CLI versions

[data-douser]

Establish comprehensive compatibility testing for the MCP server across multiple CodeQL CLI versions to ensure broad usability.

Target CLI Versions

Version	Status	Notes
v2.18.1	⏳ Untested	Minimum supported version
v2.20.3	⏳ Untested	Mid-range version
v2.21.4	⏳ Untested	Pre-2.22 API changes
v2.24.0	⏳ Untested	Current latest release

Implementation Design

1. Version Detection (server/src/lib/cli-executor.ts)

   • Parse codeql version --format=json output
   • Store detected version in session state
   • Expose via codeql_server_info tool response

2. Compatibility Matrix (server/src/lib/version-compat.ts)

   • Define feature availability per CLI version
   • Map breaking changes (e.g., --format flag changes, subcommand renames)
   • Implement version-specific command builders

3. CI/CD Validation (.github/workflows/)

   • Matrix build testing each target version
   • Download CLI via github/codeql-action/init
   • Run full integration test suite per version

4. Runtime Adaptation

   • Graceful degradation for unavailable features
   • Version-specific tool descriptions noting limitations
   • Warning logs for deprecated CLI usage patterns

Acceptance Criteria

• Version detection implemented and exposed in codeql_server_info
• GitHub Actions workflow tests all 4 target versions
• Known incompatibilities documented in README.md
• All integration tests pass on minimum supported version (v2.18.1)