Implements the PropositionGraph epistemic carrier (ADR-0144):
recognition/carrier.py — EpistemicTransition, EpistemicNode, EpistemicGraph.
Frozen, JSON-serializable, byte-deterministic. EpistemicNode wraps a
RecognitionOutcome with an append-only provenance chain; epistemic_state
property tracks last transition's to_state or outcome.state when empty.
recognition/connector.py — epistemic_node_to_graph_node(). Maps an admitted
EpistemicNode's FeatureBundle (agent/relation/count/unit) to a GraphNode
for the generation-side articulation planner.
CognitiveTurnPipeline gains a recognizer: DerivedRecognizer | None param
(default None — all existing callers unaffected). When attached, run()
calls recognize() at the top of every turn and wraps admitted outcomes in
an EpistemicGraph. CognitiveTurnResult.epistemic_graph carries it.
RuntimeConfig.recognition_grounded_graph: bool = False — opt-in flag that
replaces the intent-derived PropositionGraph with one derived from the
admitted EpistemicNode via the connector.
RatificationOutcome gains three specific PASSTHROUGH sub-values
(PASSTHROUGH_NO_FIELD / NO_VOCAB / NO_VERSOR) for _ratify_intent
observability (ADR-0142 debt 1). All normalise to "passthrough" before
trace_hash so pre-ADR-0144 hashes are byte-identical.
24/24 acceptance tests pass; 67/67 smoke tests pass; no regressions.
