Slice-3 of the worldtree-sdk cutover: migrate the session persona-state write,
the #347 authored-history write, and get_session_messages onto ratatoskr.wt, and
route the first-message preset seed through the adapter. Retire the last
hand-rolled sessions.py paths the --seed-first-message probe kept alive
(create_session + SessionInfo, set_persona_state, write_authored_history,
get_session_messages, _bifrost_error_from).
- wt.set_persona_state (SDK PadState) — the CLI passes three finite PAD axes; the
SDK owns the {"pad": {...}} wire (#317). No route-specific error row → the
SessionApiFailed default.
- wt.write_authored_history (SDK write_history) — v1 author=assistant; 404 →
AuthoredHistoryUnavailable (hide-existence; the route is the discriminator,
never the body); every other ApiError → the default. Drops the unused
author/effects/claimed_original_at params (no caller uses them).
- first_message.seed_preset_first_message now takes a WorldtreeClient and routes
through wt.write_authored_history; the best-effort invariants (INV-001..004,
never-raise/never-block/one-write/zero-worldtree-source-import) are unchanged.
Tests drive a fake WorldtreeClient — the wire is the SDK's to prove.
- CLI --set-persona-pad / --seed-first-message + the _amain and web create-path
first-message seeds rewired onto the adapter. --set-persona-pad pre-validates
PAD finiteness (clean usage_error, never a crash on the SDK ConfigurationError).
LIVE-SMOKE on personal :8081 (b128, INV-CUT-5): --seed-first-message → 201
(seq=0, phase=seeded) → read-back verbatim; --set-persona-pad → 204; the --new
create-path preset seed observed routing through the adapter. All slice-3 route
families proven end-to-end through the ratatoskr surface.
docs/coverage-map.md + first_message.contract.md re-anchored onto the adapter;
the slice-2 create/stream/cancel rows re-anchored too (they still named the
deleted sse_client/sessions symbols).
Suite 466 green; mypy no new errors (baseline 22 → 20 in the touched modules);
ruff clean. INV-CUT-1..5 held. Bifrost provider planes untouched.
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