practice: slim the tool schemas — the modelSolution IS the reveal

Owner round (2026-10-05): the problem pose only really needs statement,
mode, target, modelSolution; conclude needs no reveal field.

- problemInputObject drops decisionPoints, expectedWrongMoves, strategy,
  rationale. Halves the pose payload (the GLM incident's failing args
  were 3.3KB — a direct weak-model hardening).
- concludeInputObject drops solutionReveal: the reveal is the
  modelSolution committed at pose time, shown verbatim at conclude.
- Doctrine pass (00-base mechanics, 10-doctrine V.4/V.5): the commitment
  is the solution alone; the reveal instruction points at it.

Fixtures slimmed to the new shapes (flow, agents, heal). ConcludeCard's
render of legacy solutionReveal input stays until the card redesign
lands (Slice C).

tests/practice-heal.test.ts

@@ -41,12 +41,6 @@ describe("healEncodedArguments — the GLM incident", () => {
 			mode: QUOTED("recall"), // the incident: every field valid BUT mode
 			target: ["group-order"],
 			modelSolution: "Let |G| = p. Any x ≠ e generates a subgroup whose order divides p…",
-			decisionPoints: ["pick an element and consider ⟨x⟩"],
-			expectedWrongMoves: [
-				{ move: "reaching for Sylow", resolution: "Sylow needs p² at least; order p is direct" },
-			],
-			strategy: "single-cue recall, minimal parse cost",
-			rationale: "first problem of the session — baseline the cue",
 		};
 		// The raw shape is the incident: validation throws.
 		assert.throws(() => {