BOARD_AGENT_MODEL picks one model for every headless launch;
BOARD_AGENT_MODEL_WORK / _ACT_PR / _REVIEW beat it per intent (review
covers PR reviews and relevance checks). Empty — the default — means
the variable never reaches the adapter and the vendor's own resolution
applies, exactly today's behaviour; a stray AGENT_MODEL in the board's
own environment is stripped rather than inherited silently.
Core carries the name as an opaque string: config resolves intent →
model, _launch passes it as AGENT_MODEL, and each adapter renders it
natively — claude appends --model, opencode sets the generated
config's model key ("provider/model-id", per its docs). The resolved
model (or its absence) is recorded on the agent record, so the
Sessions and Focus views state what a run actually rode instead of
leaving it to whoever's machine the board happens to run on.
Stub-binary tests pin the byte-identical-when-unset guarantee, the
per-intent resolution, the launch-env seam and the record.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
