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).

src/core/view.ts

@@ -34,7 +34,7 @@
 
 import type { AssistantMessage, ToolResultMessage } from "@earendil-works/pi-ai";
 import type { LhMarkerMessage, LhMessage } from "./native-messages.ts";
-import { modelSolutionForConclude, PRACTICE_CONCLUDE_TOOL } from "./native-messages.ts";
+import { modelSolutionForConclude, PRACTICE_CONCLUDE_TOOL, problemInputForConclude } from "./native-messages.ts";
 import { activeCompactionOf, type CompactionDetails } from "./compaction.ts";
 import { QUESTION_TOOLS } from "./pending.ts";
 import type { SubagentArtifactData, SubagentResultMeta } from "./contracts/jobs.ts";
@@ -223,6 +223,7 @@ export function projectView(messages: readonly LhMessage[], live?: LiveTurnState
 					// time — a record fold, enriched here so the card renders pure.
 					if (block.name === PRACTICE_CONCLUDE_TOOL) {
 						part.reveal = modelSolutionForConclude(messages, block.id);
+						part.problemInput = problemInputForConclude(messages, block.id);
 					}
 					rest.push(part);
 				}