Provider errors thrown between persistSession("generating") and the turn's
own error handling (agent rebuild in ensureSessionAgent, history replay,
legacy sync createSession first turn) escaped to the route and left the
session row "generating" forever with no error, no SSE event, and no
watchdog — the modal hung on "Thinking/Generating plan" because its SSE
reconnect loop and 8s poll both treat a persisted "generating" row as
healthy.
- submitResponse/retrySession/createSession now convert any non-abort
escape after entering "generating" into the standard persisted retryable
error + SSE error broadcast before rethrowing.
- The SSE stream route reconciles settled/stranded sessions on connect
(reconcileStalePlanningGeneration): a terminal error is replayed and the
stream closed; a "generating" session with no live/pending turn past the
watchdog window is converted to a retryable interrupted error.
- Provider failures on the JSON reformat retry now surface as themselves
instead of a misleading "no valid JSON" parse error.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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