feat(broker): add iron-token-broker for race-free OAuth refresh coordination#141
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…ination iron-token-broker is a separate process that owns OAuth refresh-token state for one or more credentials. iron-proxy instances fetch current access tokens from it over HTTP, so the refresh family is never touched concurrently by multiple proxies. This solves the strict refresh-token reuse-detection trap for IdPs like OpenAI Codex and Anthropic Claude Code OAuth. The broker manages credentials via a pluggable store interface (file, 1Password SDK, 1Password Connect, AWS Secrets Manager, AWS SSM Parameter Store), runs a per-credential refresh loop with backoff, single-flights concurrent in-band refreshes with a detached context, and exposes a bearer-auth HTTP API plus Prometheus metrics. Exports OPRef / ParseOPRef / SelectConnectField from internal/transform/ secrets so the broker's 1Password backends can reuse the parser and field selector without duplication.
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Adds
iron-token-broker, a separate process that owns OAuth refresh-token state for one or more credentials. iron-proxy instances fetch current access tokens from it over HTTP so the refresh family is never touched concurrently by multiple proxies. This addresses the strict refresh-token reuse-detection trap with IdPs like OpenAI Codex and Anthropic Claude Code OAuth.The broker manages credentials via a pluggable store interface (file, 1Password SDK, 1Password Connect, AWS Secrets Manager, AWS SSM Parameter Store), runs a per-credential refresh loop with backoff, single-flights concurrent in-band refreshes with a detached context so a leader cancellation doesn't poison waiters, and exposes a bearer-auth HTTP API plus Prometheus metrics. Treats any OAuth
errorcode as terminal (no retries against reuse-detecting IdPs). SeeREADME.iron-token-broker.mdfor the bootstrap procedure, deployment patterns, and per-backend config.Also exports
OPRef/ParseOPRef/SelectConnectFieldfrominternal/transform/secretsso the broker's 1Password backends reuse the parser and field selector without duplication.