Harden RPC-fault reliability: bound locks/timeouts and cap fan-out (7 fixes)#1430

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kAIPraxisBot wants to merge 12 commits into

gonka-ai:gm/gateway-v2-devshard-v2-poc-observabilityfrom

kAIPraxisBot:kai/rpc-fault-hardening

Commits on Jul 8, 2026

fix(inference/rpc): bound RPC HTTP client so a stalled node cannot hang callers
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fix(api): bound chain Status() lookups on the request path with a deadline
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fix(devshard): bound concurrent escrow-rotation chain transactions
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fix(proxy/sidecar): don't wipe validator whitelist on transient resolution failure
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fix(devshard): bound finalizeMu hold across the settlement Finalize protocol
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fix(api): don't hold the epoch-group cache lock across the chain query
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fix(api): don't hold the authz cache lock across the signer chain queries
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fix(inference/rpc): bound the whole request incl body read, not just headers
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fix(api): run coalesced cache queries under a decoupled context
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fix(proxy/sidecar): gate whitelist-preserve guard on participants that have a URL
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refactor(api): use singleflight DoChan so a caller can abandon its own wait
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fix(proxy/sidecar): key the whitelist-preserve guard on DNS failures
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