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Marc-André Bombeck
ba4774e48a
The health ledger already counted every failed call and paused a provider that kept failing, with a pause that grows. A paused provider only moved to the tail of the chain, though, and the tail is still walked: a chain whose only entry answered every call with reasoning and no answer was called by every background job regardless. A walk for background work (surface "job") now leaves out every provider the ledger has benched until its window lifts; the local floor only once it is paused, past a brief backoff. One ai.chain.background_paused line per window says so. A person's own call still reaches the provider at the tail and reports its own error. The ledger is in Postgres, so the bench holds across workers and restarts. The status, briefing and document-index paths refunded a failed call in full, so background spend on replies without an answer never reached the day's token ceiling. A failed chain now carries the tokens its hops reported (tokensSpent) and those paths charge them. The two clients share one answerless step (askAgainUnreasoned), which keeps both inside the source size ratchet; its baselines go down. Refs #1279