Cherry-pick of d79a4bd2 from PR #318 onto fresh main base (PR #318 closed).
Issue #310: platform a2a-proxy logs ~300/hr
`timeout awaiting response headers` because ResponseHeaderTimeout was hardcoded
to 60s. Opus agent turns (big context + internal delegate_task round-trips)
routinely exceed 60s, so the proxy gave up before headers arrived even when
the workspace agent was healthy.
Changes:
- a2a_proxy.go: ResponseHeaderTimeout: 60s hardcoded →
envx.Duration("A2A_PROXY_RESPONSE_HEADER_TIMEOUT", 180s).
180s gives Opus turns comfortable headroom. The X-Timeout caller header
still bounds the absolute request ceiling independently.
- a2a_proxy_test.go: TestA2AClientResponseHeaderTimeout verifies the 180s
default and env-override parsing logic.
Env var: A2A_PROXY_RESPONSE_HEADER_TIMEOUT (e.g. 5m, 300s).
Closes#310.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Molecule AI Fullstack Engineer
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