fix: nil-resolved transform fields deliver no input; agent reserved carriers read absence - #64
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An input_transform field whose expression resolves to nil produces an input entry with nil content. The reserved carriers (context, model, agent_id) now read that as "not provided" instead of failing the node, and nil-content inputs render no prompt tag.
Raw inputs either exist with content or do not exist; input_transform now holds the same contract instead of materializing nil-content entries.
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An input_transform field whose expression resolves to nil previously materialized a nil-content input entry. The agent node's reserved carriers (context, model, agent_id) rejected that shape as malformed and failed the node, and nil-content inputs rendered a literal nil prompt tag.
Two-layer fix:
This unblocks workflow-lowered agent blocks passing arena context and model overrides through their payload: a payload without those keys must run, not fail.
Tests: 960 sqlite suite green (3 new unit cases + 1 end-to-end input_transform case). Lint clean apart from the pre-existing fixpoint warning.