Completes the adapter's session/turn surface, still additive and non-breaking (no
surface rewired, no hand-rolled path deleted — the cli/web rewire + deletions +
live smoke are part 2b).
- stream_turn: drives the SDK's resilient stream (auto-resume absorbs the old
reconnect_turn) and yields SDK TurnEvents, re-wrapping the stream's TERMINAL SDK
errors into ratatoskr's caller-semantic exceptions per DEC-2 (SessionRetired →
SessionApiFailed; AgentNotAvailable / TurnLaunchUnavailable / MalformedSse* /
TurnIdFlip → ratatoskr's same-named types; ConnectionDropped → SseConnectionDropped;
ConnectFailed / terminal ResumeError → SseConnectFailed). The presenter keeps
catching ratatoskr types (part 2b aligns the except clauses).
- cancel_turn: returns the SDK CancelResult (a 200 cancelled=False is the benign
late-cancel race, B-CAN-3), mapping the typed cancel races onto ratatoskr's
CancelTurnNotFound / CancelAlreadyCompleted / CancelFailed.
- SseConnectionDropped.last_seen_sse_id widened to SseId | str | None: the SDK's
resume cursor is a raw composite-id str (the cutover's target form); the
hand-rolled path's SseId stays accepted until it is deleted. The one live reader
(stream_turn_resilient) generalizes cleanly — a str cursor is already the id.
Suite 570 green (555 + 15); wt.py + sse_client.py mypy + ruff clean. Patch.
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