refactor: split submit_sft_via_cml.sh into submit_sft.sh + submit_cml_eval.sh

- submit_sft.sh: pure SFT submission, prints JobID and exits (no embedded watcher)
- submit_cml_eval.sh: pure CML eval, reads workflow_id/version from config.yaml
- jupyter_runtime write_text: rewrite to use Contents API instead of terminal websocket
- SKILL.md: restrict trigger to explicit UI click only
- program.md: update §5.2 docs to reflect two-script workflow

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/app/components/training/step-detail-sheet.tsx

@@ -535,7 +535,7 @@ type IterationEntry = {
 	iteration?: number;
 	runDic?: number;
 	timestamp?: string;
-	hypothesis?: string;
+	hypothesis?: unknown;
 	intervention?: { type?: string; summary?: string } | string;
 	prediction?: Record<string, number | string>;
 	results?: Record<string, number | string>;
@@ -546,7 +546,7 @@ type IterationEntry = {
 		cases?: number;
 	}>;
 	error_delta?: { persistent?: number; new?: number; fixed?: number };
-	next_hypothesis?: string;
+	next_hypothesis?: unknown;
 	[key: string]: unknown;
 };
 
@@ -648,7 +648,7 @@ function IterationCard({
 			<div className="space-y-3 px-4 py-3 text-[13px]">
 				{entry.hypothesis ? (
 					<Field label="假设" tone="primary">
-						{entry.hypothesis}
+						<RichText value={entry.hypothesis} />
 					</Field>
 				) : null}
 				{intervention.summary || intervention.type ? (
@@ -737,7 +737,7 @@ function IterationCard({
 				) : null}
 				{entry.next_hypothesis ? (
 					<Field label="下一步假设" tone="accent">
-						{entry.next_hypothesis}
+						<RichText value={entry.next_hypothesis} />
 					</Field>
 				) : null}
 				{otherKeys.length > 0 ? (
@@ -759,6 +759,18 @@ function IterationCard({
 	);
 }
 
+function RichText({ value }: { value: unknown }) {
+	if (value == null) return null;
+	if (typeof value === "string" || typeof value === "number") {
+		return <>{String(value)}</>;
+	}
+	return (
+		<pre className="overflow-x-auto whitespace-pre-wrap break-words font-mono text-[11px] leading-relaxed">
+			{JSON.stringify(value, null, 2)}
+		</pre>
+	);
+}
+
 function Field({
 	label,
 	children,