The round-10 rebase stubbed providerUploadFeedback to an explicit error
because its v1 ProviderService route died with the v2 rewrite. The route
now goes through the v2 runtime: session runtimes may expose an optional
uploadFeedback capability, the Codex adapter implements it against the
app-server's feedback/upload request, and the WS handler resolves the
thread's live provider session through ProviderSessionManagerV2 —
failing with a plain-language reason when no session has run, the session
is gone, or the driver has no feedback channel. This also un-blocks the
dormant mobile feedback UI.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>