The Zen relay still LISTS deepseek-v4-flash-free in GET /zen/v1/models but no longer
serves it (opencode.ai/docs/zen dropped it; every anonymous POST 400s "Upstream request
failed: Model is unavailable"). Removing it from the offline floor alone leaves the picker
offering it whenever the live fetch succeeds — which is nearly always — so the first turn
400s and the fallback switch strands the session (#111749).
Add it to the live-list exclusion set (renamed from the keyed-twin-only
_OPENCODE_FREE_KEYED_SUFFIX_MODELS to _OPENCODE_FREE_EXCLUDED_MODELS, same semantics for
ox-alpha-free), drop the same id from the opencode-zen keyed catalog (a Zen pick of a free
slug heals to the keyless relay and 400s the same way), move the test fixture's "current
free tier" to the relay's actual state, and pin the filter with one invariant test.
teknium1
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