Composes the FieldState (A) and VaultStore (B) codecs with new codecs for
SessionGraph/TurnNode, ReferentRegistry/ReferentEntry, Proposition, and
DialogueTurn into SessionContext.snapshot()/restore() — the complete lived
session state that must survive reboot for resume-as-same-life.
- session/graph.py: TurnNode + SessionGraph to_dict/from_dict (versors bit-exact).
- session/referents.py: ReferentEntry + ReferentRegistry, preserving the
_slots<->_history object aliasing via slot->history-index (update_turn_versor
relies on `is` identity).
- generate/proposition.py + generate/dialogue.py: Proposition + DialogueTurn
codecs (relation_norm is derived in __post_init__, not persisted).
- vault/store.py: complete the metadata codec — vault metadata can hold a
Proposition ({"kind":"proposition",...} from generate/proposition.py), tagged
on encode and reconstructed on decode (lazy import, cycle-free). This closes a
gap Phase B assumed away ("metadata is primitives only"); surfaced by the
Phase C JSON-safe integration test.
- session/context.py: snapshot()/restore(). vocab/persona are NOT serialized
(shared, supplied at restore); restore() mutates self by design (a load).
Exit gate: a real 4-turn session, snapshotted and restored into a fresh context,
is field-equal — field bit-exact, vault recall identical, graph/referents/
dialogue preserved (incl. the referent aliasing). 9 new tests; INV-02 +
session-coherence regression green (68 passed).
Part of the A->E Shape B+ scope (Phase C).
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