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Retry OAuth token refresh on server errors (#4513)

* Retry OAuth token refresh on server errors

When a load balancer or CDN returns an HTML error page during
token refresh, the workload is immediately marked as
unauthenticated with no retry. Remote MCP servers become
permanently broken until manually restarted, even when the
OAuth server recovers seconds later.

Fixes #4512

Co-authored-by: Claude <noreply@anthropic.com>
Signed-off-by: Greg Katz <gkatz@indeed.com>

* Fix spellcheck: unparseable → unparsable

Signed-off-by: Greg Katz <gkatz@indeed.com>

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Signed-off-by: Greg Katz <gkatz@indeed.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Chris Burns <29541485+ChrisJBurns@users.noreply.github.com>

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