question tools: phase-visible names, hardened teach schemas, context-slim seams

The tools_fails_2 diagnosis (glm-5.3 dropping trailing required fields):
- probe-phase quiz/explain renamed to probe/recall — a shared name carried
  the probe call shape into teaching (the first teach quiz dropped nodeId);
  display seams accept the old names forever
- teach quiz+explain schemas lead with the required pair (type, nodeId);
  explain gains the predict/check type and joins the reveal law (checks
  collapse, predictions arrive open; no-type records render check-style)
- plan_init/probe_done results go context-slim (owner, context diet):
  content = validated nodeIds + binding-id reminder / fixed ack; details
  keeps the tree for the popup and {ok:true} — serializer-verified that
  details never reaches the model; failure echoes dropped
- the cards carry the tool's own name (Probe/Recall) and the quiz type
  reads on the label (Prediction/Check) in composer and transcript

src/core/contracts/probe.ts

@@ -81,5 +81,14 @@ export interface ProbeDoneResult {
 	ok: boolean;
 	/** Refusal reason when ok === false (open question, already concluded). */
 	error?: string;
-	assessment?: ProbeAssessment;
 }
+
+/** The probe_done ack's model-facing text (owner, context diet
+ *  2026-10-09): the assessment is the CALL's arguments — durable in the
+ *  transcript, streamed to the learner — so echoing it back in the
+ *  result would duplicate the probe phase's largest payload in every
+ *  future context. The agent sees this fixed line instead; `details`
+ *  carries only {ok:true} for the record/UI. Same doctrine as
+ *  CONCLUDE_ACK_TEXT. */
+export const PROBE_DONE_ACK_TEXT =
+	"Assessment recorded — it is shown to the learner now and the teacher plans from it. Say your closing sentence and end your turn; the teaching phase takes over from here.";