Two unrelated production failures with a shared symptom of an opaque error.
Chat: FN-8869 hoisted the agent-existence check out of its else branch, so it ran
even when the client supplied an explicit model pair. Model-target chats send the
client-only sentinel `__fn_agent__`, which is never an agent row, so every one of
them 404'd behind the generic "Failed to create chat session" toast. The agent is
now required only when it is the source of model resolution.
Self-healing: a failed `tip-already-merged` cleanup was rethrown and classified
`branch-conflict-unrecoverable`, failing and pausing tasks whose branch was already
an ancestor of the integration ref. Every one of the 78 logged parks carried a
`git worktree remove --force` / `ENOTEMPTY rmdir node_modules` message -- a pnpm
race, not a conflict. Cleanup failure now retries on the next sweep, and prune runs
before removal so a stale registration stops causing the failure it would prevent.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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