- 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.
can1357