- Transitioned the eval tool from batch multi-cell execution to a single-step input structure with flat parameters.
- Updated core agent logic, UI components, and documentation to support state persistence across incremental eval calls.
- Restricted bash tool capabilities by requiring explicit use of `read` or `find` instead of `ls` or `find`.
- Added support for Ruby and Julia language runtimes to the eval tool and associated web renderers.
- Assert the eval tool hides disabled backends from the model-facing wire
schema (language enum + field descriptions), summary, and description by
default (rb/jl off), and advertises them once enabled — including the
enabled-subset case.
- Update the env-flag fallback test for the new rb/jl opt-in defaults and
extend the env guard to PI_RB/PI_JL so the suite is shell-independent.
- Note the opt-in default and dynamic advertising in the changelog.
- Ensured eval LLM calls always include a non-empty system prompt to avoid 400s.
- Aligned eval tool docs with session spawn policy by omitting agent() when spawns are disallowed.
- Added regression coverage for default system prompts and spawn-aware agent() description behavior.
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