practice: the agent's data drawer — full transparency on every conclude card (round 17)

Owner ask (2026-10-06): reveal everything the agent filled in when
writing the problem and concluding it, at the very bottom of the
conclude card, collapsible, arriving collapsed.

The fields, both calls:
- problem: mode (recall/discrimination/composition), target
  proposition ids, statement, modelSolution (the last two ARE the
  visible card — the drawer shows the metadata only)
- conclude: outcome, hint rung (R0–R5/null), miss class
  (cue/discrimination/execution/careless/structural/null), retest.

Seams: problemInputForConclude (native-messages) walks the reveal's
walk and folds the WHOLE problem-call input onto the conclude part
(projectView join; same refused-pose law — an unacked pose folds
nothing); ArtifactPartProps grows problemInput. Targets resolve to
proposition NAMES at render (one lazy module-cached /api/graph fetch;
failure degrades to raw ids — observability never breaks the card).
The drawer: divider + chevron 'AGENT'S DATA' toggle (mono-caps
eyebrow register), definition rows with mono values, 'untagged'/
'none' honest empties, absent entirely when the calls filled nothing
(the dismissal line, legacy bare records).

tests/render-practice-surface.test.tsx

@@ -137,6 +137,35 @@ describe("the practice transcript cards", () => {
 		assert.match(html, /Pair them; each pair is even\./);
 	});
 
+	it("ConcludeCard: THE AGENT'S DATA DRAWER (owner round 17) — arrives collapsed, opens to every field both calls filled", () => {
+		const collapsed = renderToStaticMarkup(
+			<ConcludeCard
+				part={part({
+					type: "tool-conclude",
+					input: { outcome: "solvedWithHints", verdict: "v", rung: "R2", missClass: "cue", retest: true },
+					problemInput: { mode: "discrimination", target: ["n_abc"] },
+					reveal: "The solution.",
+				})}
+			/>,
+		);
+		assert.ok(collapsed.includes('data-testid="agents-data-toggle"'), "the toggle row");
+		assert.ok(collapsed.includes("Agent"), "the label");
+		assert.ok(!collapsed.includes('data-testid="agents-data"'), "arrives COLLAPSED — no rows in the markup");
+		// The drawer is a client useState fold; the OPEN face is pinned by the
+		// rows' data shape (view join) below — static render cannot toggle.
+	});
+
+	it("ConcludeCard: no drawer when the calls filled nothing beyond the visible card", () => {
+		const html = renderToStaticMarkup(
+			<ConcludeCard part={part({ type: "tool-conclude", input: { outcome: "dismissed" } })} />,
+		);
+		assert.ok(!html.includes("agents-data"), "the dismissal line carries no drawer");
+		const legacy = renderToStaticMarkup(
+			<ConcludeCard part={part({ type: "tool-conclude", input: { outcome: "solved" }, reveal: "s" })} />,
+		);
+		assert.ok(!legacy.includes("agents-data"), "empty problemInput + bare outcome: nothing to reveal");
+	});
+
 	it("ConcludeCard: the dismissal synthesis is one muted line — no reveal card", () => {
 		const html = renderToStaticMarkup(
 			<ConcludeCard part={part({ type: "tool-conclude", input: { outcome: "dismissed" } })} />,