First slice-2 increment: the presenter-independent sessions routes, additive and
non-breaking (no surface rewired, no hand-rolled path deleted yet — the cli/web
rewire + deletions + live smoke land in part 2).
- create_session / list_sessions / get_session_messages / get_session_tools over
WorldtreeClient.sessions.*, each building the request from ratatoskr's domain
params and mapping the SDK's ApiError floor by ROUTE (INV-CUT-2): create 404 →
AgentNotFound, bound 502 → BifrostHandshakeFailed, list 422 cursor_invalid →
InvalidCursor, else the SessionApiFailed default.
- Open-world reads returned VERBATIM (parity-pass posture): the routes return the
SDK's open dicts, not ratatoskr's typed SessionInfo/SessionPage — those typed
result shapes retire when the presenters are rewired to read mappings (adopt the
dep's canonical open-world way, reference-impl doctrine).
- Transitional: wt imports the caller-semantic exceptions + BifrostBinding from the
retiring sessions module (one-way, no cycle); they relocate into the adapter as
their call-sites are rewired.
- Cancel + the resilient turn STREAM are deferred to part 2, where they wire into
the async presenter loop and are validated by the live smoke.
Suite 555 green (541 + 14); mypy strict + ruff clean. Patch (internal, additive).
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