* feat(decisions): add an OpenAI Decisions backend for the decision slots
Issue #7005 asked for a second decision provider behind the interfaces the
TypeSafe (Jev) integration already uses, not a new decision system.
`deerflow/openai_decisions` speaks `POST /v1/decisions`: a `noul` question
becomes a `predicate` whose true/false rubric folds into `instructions` (the
endpoint has no criteria field, and dropping it would move the decision
boundary while the adapter kept reporting the same criteria in its policy
identity), answers arrive as an array rather than a mapping, and a refusal is an
answer `type` rather than an HTTP failure -- so it lands in the existing
per-question error channel and each consumer keeps its own failure direction.
Transport is reused rather than copied. `provider_label` and the connection's
`endpoint_path` are the only two seams a dialect needs, so retry and backoff,
the deadline budget, the bounded never-decoded body read and the error taxonomy
keep one owner; `resolve_decisions_connection` pairs the two so a Decisions
connection cannot be built pointing at System One. The three adapters override
their connection resolution, their client, and the value the endpoint judges
(`input` text instead of a `state` object), and inherit thresholds, rubrics,
caches and audit policy unchanged. Wiring stays a `use:` class path, so no
config schema is added.
* fix(decisions): isolate endpoint identities and correct diagnostics
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Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
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