Store category prompts as EXACT split legacy text, no boilerplate

The per-category prompt editor showed English machine boilerplate
("Role: description. Build JSON …", schema intro, {{var}} context lines)
because seed/sync baked the render framing into categories.prompt. Now the
stored overlay is exactly the legacy wp_product_categories.sql content,
split into the three sections a user would type themselves:

  --- Title ---        Slovenian naming formula
  --- Description ---  legacy <H2>/<p>/<ul> body structure
  --- Meta ---         legacy metaDescription instruction

Schema, role framing, and Name/Description/Category/Attrs product context
stay render-time only (system template + ensureCategoryEnhanceUserContext),
where they already existed.

- SplitLegacyCombinedEnhancePrompt: non-legacy input now returns "" —
  categories without seed/legacy content get their override CLEARED
  (company default) instead of being stuffed with the canonical template
  (e.g. parent categories like "Bela tehnika" absent from the SQL).
- CategoryEnhancePromptNeedsRepair flags stored boilerplate ("parsed as
  JSON", "Build JSON", retired Attributes section) so Sync rewrites old
  data to the clean shape; repair supports clearing (prompt = '{}').
- seed-a1 apply-category-prompts skips instead of writing template text.
- Web editor compose stores only the user's section text: empty sections
  keep bare markers, default bodies and the default preamble are never
  persisted (DEFAULT_SECTION_BODIES removed).
- Verified locally: apply rewrote 238 A1+Demo categories (216 exact
  splits, 22 cleared), zero boilerplate matches in DB, idempotent re-run
  (would_update=0).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/web/src/lib/categories/prompt-sections.ts

@@ -34,19 +34,14 @@ export const LEGACY_ATTRIBUTES_MARKERS = {
 	end: "--- End Attributes ---"
 } as const;
 
-/** Canonical shared intro (same idea as CategoryEnhanceUserTemplate preamble). */
+/**
+ * UI-only default intro shown in the editor for context. NEVER stored: the
+ * stored prompt is exactly the user's section text — schema/role framing and
+ * product context are supplied by the pipeline at render time.
+ */
 export const DEFAULT_ENHANCE_PREAMBLE =
 	"Write all product text in {{language}} (do not hardcode a language). Keep the title, description, and SEO meta consistent with the product evidence below.";
 
-/** Minimal role bodies used when a section is empty on compose (keeps markers valid). */
-export const DEFAULT_SECTION_BODIES: Record<EnhancePromptSectionId, string> = {
-	title:
-		"Write a short retail product title from the title formula and attributes — never brand-only. Include product type and full model when evidence exists; follow any title formula constraints that follow.\nName: {{name}}",
-	description:
-		"Write the product description as HTML (not SEO meta). When a description formula follows, cover each section in order as one HTML string; otherwise prefer 1–3 factual paragraphs with simple HTML (<h2><p><ul><li>).\nDescription: {{description}}",
-	meta: "Write the SEO title (50–60 characters) and SEO description (120–155 characters) as plain text, never HTML. Follow any SEO meta formula that follows; do not copy the full description into the SEO description."
-};
-
 export type SectionSchemaHint = {
 	/** JSON keys this section is responsible for in the one-shot enhance reply. */
 	jsonKeys: string[];
@@ -170,20 +165,29 @@ export function parseEnhancePrompt(prompt: string): ParsedEnhancePrompt {
 }
 
 /**
- * Compose preamble + section bodies back into the stored enhance USER template shape.
- * Empty section bodies fall back to DEFAULT_SECTION_BODIES so markers stay valid.
+ * Compose section bodies back into the stored enhance USER template shape.
+ * Stores ONLY the user's text inside the markers — empty sections keep bare
+ * markers, and the default preamble is never persisted (a custom, non-default
+ * preamble from an existing prompt is kept).
  */
 export function composeEnhancePrompt(
 	preamble: string,
 	sections: Partial<Record<EnhancePromptSectionId, string>>
 ): string {
-	const intro = (preamble.trim() || DEFAULT_ENHANCE_PREAMBLE).trim();
-	const parts: string[] = [intro, ""];
+	const intro = preamble.trim();
+	const parts: string[] = [];
+	if (intro && intro !== DEFAULT_ENHANCE_PREAMBLE.trim()) {
+		parts.push(intro, "");
+	}
 
 	for (const id of ENHANCE_PROMPT_SECTIONS) {
 		const { start, end } = SECTION_MARKERS[id];
-		const body = (sections[id] ?? "").trim() || DEFAULT_SECTION_BODIES[id];
-		parts.push(start, body, end, "");
+		const body = (sections[id] ?? "").trim();
+		if (body) {
+			parts.push(start, body, end, "");
+		} else {
+			parts.push(start, end, "");
+		}
 	}
 
 	return parts.join("\n").trim();

apps/web/src/lib/category-prompt-sections.test.ts

@@ -75,16 +75,22 @@ describe("category prompt sections", () => {
 		assert.equal(parsed.sections.title, "");
 	});
 
-	it("compose fills empty sections with defaults so markers remain", () => {
+	it("compose stores ONLY the user's text — no boilerplate, no preamble", () => {
 		const out = composeEnhancePrompt(DEFAULT_ENHANCE_PREAMBLE, {
-			title: "Custom title rules",
+			title: "Napiši novo ime izdelka po formuli",
 			description: "",
 			meta: ""
 		});
 		assert.equal(hasEnhanceRoleSections(out), true);
-		assert.match(out, /Custom title rules/);
-		assert.match(out, /product description as HTML/);
+		assert.match(out, /Napiši novo ime izdelka po formuli/);
+		// Empty sections keep bare markers; nothing is injected.
+		assert.equal(out.includes(DEFAULT_ENHANCE_PREAMBLE), false);
 		assert.equal(out.includes(LEGACY_ATTRIBUTES_MARKERS.start), false);
+		assert.equal(out.toLowerCase().includes("write the"), false);
+		const reparsed = parseEnhancePrompt(out);
+		assert.equal(reparsed.sections.title, "Napiši novo ime izdelka po formuli");
+		assert.equal(reparsed.sections.description, "");
+		assert.equal(reparsed.sections.meta, "");
 	});
 
 	it("isEnhancePromptEmpty ignores default preamble", () => {

apps/web/src/lib/merchant-copy.test.ts

@@ -8,10 +8,7 @@ import { describe, it } from "node:test";
 import { UI_LOCALES } from "./i18n/locales.ts";
 import { en } from "./i18n/messages/en.ts";
 import { loadAllMessages, messagesFor } from "./i18n/messages/catalog.ts";
-import {
-	DEFAULT_ENHANCE_PREAMBLE,
-	DEFAULT_SECTION_BODIES
-} from "./categories/prompt-sections.ts";
+import { DEFAULT_ENHANCE_PREAMBLE } from "./categories/prompt-sections.ts";
 
 const CUSTOMER_DEMO_EMPTY_KEYS = ["dashboard.demoEmptyHint", "dashboard.demoEmptyMessage"] as const;
 const CUSTOMER_ETL_KEYS = [
@@ -72,9 +69,8 @@ describe("customer-visible copy leaks", () => {
 	});
 
 	it("category prompt defaults hide JSON schema jargon from customer text", () => {
-		const blob = [DEFAULT_ENHANCE_PREAMBLE, ...Object.values(DEFAULT_SECTION_BODIES)].join("\n");
-		assert.doesNotMatch(blob, /system schema/i);
-		assert.doesNotMatch(blob, /your reply is parsed as json/i);
-		assert.doesNotMatch(blob, /build json/i);
+		assert.doesNotMatch(DEFAULT_ENHANCE_PREAMBLE, /system schema/i);
+		assert.doesNotMatch(DEFAULT_ENHANCE_PREAMBLE, /your reply is parsed as json/i);
+		assert.doesNotMatch(DEFAULT_ENHANCE_PREAMBLE, /build json/i);
 	});
 });