feat(#20): worldtree-sdk adapter foundation — ratatoskr.wt (slice-1)
Slice-1 of the SDK cutover (docs/contracts/worldtree_sdk_cutover.contract.md): the adapter chokepoint onto worldtree-sdk 1.0.0, unit-tested but not yet wired to any surface (that is slice-2). - build_client(base_url, *, api_key, admin_key=None, transport) constructs the single WorldtreeClient over a ratatoskr-owned injected httpx.AsyncClient. INV-CUT-1: the SDK is given the transport (_owns_client=False) and never closes it — proven by a test asserting aclose() leaves ratatoskr's transport open. - translate_error implements the § Error map DEFAULT: SDK ApiError → the adapter's SessionApiFailed (carrying the SDK's parsed status/error_code/body); every discriminated WorldtreeError subclass passes through by identity. Route-specific rows land at their call-sites in later slices (the route is the discriminator). - SessionApiFailed gains error_code vs the retiring sessions.py copy (extends it per the contract error-map row); the two coexist transiently and reconcile in slice-2 (DEC-4 incremental cutover — nothing wires the adapter this slice, so they never meet at runtime). Deletes no hand-rolled path, so DEC-4's live-smoke bar does not apply yet. Suite 541 green (534 + 7 new); mypy + ruff clean. Patch (internal foundation; the cutover's minor bump is DEC-6 at slice-7 ship).
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