* fix(proxy): raise live budget counters for failure spend rows
A stream that breaks mid-flight writes its recovered cost to the spend log, but the failure hook
had already released the reservation and never touched the live counters, so an over-budget key
kept passing until the counter was next repaired from the database
Every charged failure row with a cost now raises the same counters the success path raises. The
error waits at most a second for them, so a hung Redis cannot hold it back
Fixes#35568
* test(proxy): cover failure spend counters across budgets, endpoints and outages
Integration cells for team, user, end-user, tag and window budgets,
concurrent streams, billed retries, native /v1/messages, Bedrock guardrail
cost, a Redis stall on two workers and disable_spend_updates
* test(proxy): check stalled failure counters and use the real spend writer
- The Redis stall cell now reads the burst key's live counter and requires at least the full failure spend
- Unit tests drop the charging writer double, bare dicts, list mutation and wall-clock timestamps
- Partial-stream test models are frozen
* test(proxy): move the stalled counter bound reason into the assert message
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Co-authored-by: yucheng-berri <293926326+yucheng-berri@users.noreply.github.com>
