feat(#20): rewire the CLI turn path onto the wt adapter (slice-2, part 2b-i)
The --send turn path (_amain create + _run_turn stream + _cancel_and_log) now goes
through ratatoskr.wt over the worldtree-sdk; external CLI behavior (output, exit
codes) is preserved. No hand-rolled path is deleted yet — web/server.py still uses
them (part 2b-ii), so the deletions + live smoke come after web is rewired.
- _amain builds one WorldtreeClient via wt.build_client over a ratatoskr-owned
transport (INV-CUT-1); create → wt.create_session (reads the SDK's open create
dict); the transport keeps the default bearer so the not-yet-migrated hand-rolled
seed_preset_first_message (slice-3) still authenticates.
- _run_turn drives wt.stream_turn and consumes SDK TurnEvents; the mid-stream cancel
target is parsed from the composite sse_id ("{turn}:{seq}") — the SDK's top-level
turn_id is the body field and is absent on text/thinking frames.
- CliPresenterState.render consumes the SDK TurnEvent union with None-hardening on
the now-optional fields (usage degrades to "(n/a)" rather than crashing).
- The SDK normalizes a pre-response transport failure to ConnectFailed(status=0);
_amain (network → exit 21) and _cancel_and_log (swallow, INV-009) catch it.
- build_client gains max_reconnects (SDK default 5; tests pass 0 to surface drops
immediately). test_cli: SDK-event factories keep the render-test bodies intact;
client constructions wrap in build_client; cancel-race mocks carry the SDK's
(status, error_code) pair.
Suite 570 green; cli.py + wt.py mypy + ruff clean (the pre-existing send_content
arg-type note is unchanged). Patch (internal; external CLI behavior preserved).
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