v0.2.4

Changelog

• b344849 Add framework integration guides for OpenAI, ADK, and AutoGen (#110)
• 3690686 Add governance, roadmap, and security assurance docs (#108)
• 92c1330 Add pipelock test command for config validation (#109)
• 2c2c651 Add pre-execution tool call policy for MCP proxy (#107)
• 3fa2121 Add secrets_file for known secret value scanning (#111)
• 29eac1e Fix Unicode bypass in injection and DLP scanning (#105)
• 2ab6c74 Polish docs and README for release (#113)
• be4a7f8 Prepare v0.2.4: changelog, update version refs (#115)
• 9666982 Update OpenSSF Best Practices badge to silver level (#114)
• 63ecfa7 feat(mcp): add Streamable HTTP transport for MCP proxy (#112)