- Changed default evaluation backend configuration to only enable Python and JavaScript by default.
- Implemented dynamic tool parameter generation to hide Ruby and Julia from the model's schema when they are disabled in settings.
- Updated tool summary and field descriptions to reflect the currently enabled runtime backends.
- Implemented persistent execution backends for Ruby and Julia using dedicated kernel processes and NDJSON-based IPC.
- Integrated language-specific prelude environments, runtime path resolution, and security-focused environment variable filtering.
- Exposed configuration options, tool schema updates, and lifecycle management for seamless agent interaction with both languages.
- Added comprehensive integration tests and updated prompt documentation to support the new evaluation capabilities.
- Made PI_INTENT_TRACING, PI_AUTO_QA, PI_PY, and PI_JS take precedence when set.
- Fell back to config when the env flag is unset instead of ORing.
- Surfaced PI_PY=0/PI_JS=0 in the disabled-backend error messages.
- Moved EvalBackendsAllowance and related functions to a dedicated eval-backends.ts module.
- Replaced ad-hoc brokenShellSessions tracking with a quarantineShellSession helper that also awaits the abort cleanup promise.
- Applied quarantine on timeout and cancellation paths, not just errors.
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