* fix(streaming): per-provider fetch-start timeout cap override (#11526 follow-up)
Buffered gateways (opencode-go / command-code Console Go tiers) legitimately
buffer a whole reasoning generation before the first upstream byte, so their
streaming requests can exceed the default 110s headers-wait cap. #11526 capped
every streaming request at that ceiling, so these long generations died at
exactly 'Fetch timeout after 110000ms' (504) before any bytes arrived.
Add a per-provider fetchStartTimeoutCapMs registry knob (600s for opencode-go
and command-code) and project it into the executor's LegacyProvider so
resolveFetchStartTimeout caps only genuinely unbounded providers.
* docs(changelog): add fragment for fetch-start cap per-provider override
Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>
---------
Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>
Co-authored-by: alvinveroy <alvinveroy@users.noreply.github.com>
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