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Three verified backlog fixes: - #3219: `gbrain models doctor` probed only the global chat + expansion models, so a per-task background route (models.dream.synthesize, models.think, facts.extraction_model, ...) configured to a distinct unreachable provider still reported green. New resolvePerTaskProbePlan resolves every PER_TASK_KEYS route the same way buildReport does, dedups against already-probed models and across routes, and probes each distinct resolved model once with the comma-joined route keys as the probe touchpoint for attribution. - #3221 (takeover of open PR #3250): the doctor chat/expansion probe used maxTokens: 1, which falsely fails reasoning models (output budget spent on internal reasoning; some providers reject sub-minimum caps outright). Probe budget raised to a shared PROBE_MAX_OUTPUT_TOKENS constant, widened above any configured extended-thinking budget, and a length-exhausted empty completion is classified reachable with the limitation surfaced. Added on top: a catch-branch classification so the probe stays coherent with #3249's gateway-side contentless-completion rejection if that lands. - #3206: reconfigureGatewayWithEngine passed the file-plane chat_model / expansion_model as resolveModel's bottom-rung `fallback`, so TIER_DEFAULTS silently replaced explicit user config on every engine-backed startup (and every chat-gated feature reported unavailable on non-Anthropic brains, with no error). New `userFallback` slot ranks explicit user config above the tier default while env/config-key overrides still win. The silent-zero half is also fixed: the facts extraction and classifier gates now check availability of the model the call will actually use, not the global chat default. Co-authored-by: Masashi-Ono0611 <Masashi-Ono0611@users.noreply.github.com> Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>