made tiny updates

packages/ai-layer/src/features/diff-summary.ts

@@ -1,11 +1,13 @@
 import type { AIGateway } from '../gateway.js';
-import { buildSystemPrompt } from '../prompts/system.js';
+import { buildDiffSummaryMessages, buildAggregateSummaryMessages } from '../prompts/diff-summary.prompt.js';
 
 export interface DiffSummaryInput {
   /** Serialized component-level changes (JSON) */
   changesJson: string;
   /** Component name */
   componentName: string;
+  /** Active DLF as JSON string — passed through for rule-violation annotation */
+  dlfJson?: string;
 }
 
 export interface DiffSummaryOutput {
@@ -16,17 +18,54 @@ export async function generateDiffSummary(
   gateway: AIGateway,
   input: DiffSummaryInput
 ): Promise<DiffSummaryOutput> {
-  const system = buildSystemPrompt({ role: 'a technical writer summarizing UI component changes' });
+  const { system, userContent, maxTokens } = buildDiffSummaryMessages(input);
 
   const response = await gateway.complete({
     system,
-    messages: [
-      {
-        role: 'user',
-        content: `Summarize the following component changes for "${input.componentName}" in one concise sentence (max 20 words) suitable for a developer reviewing a pull request. Focus on what changed and its purpose.\n\n<changes>\n${input.changesJson}\n</changes>\n\nRespond with only the summary sentence.`,
-      },
-    ],
-    maxTokens: 128,
+    messages:    [{ role: 'user', content: userContent }],
+    maxTokens,
+    temperature: 0.2,  // spec Layer 6.3: 0.2 for diff-summary (consistent output)
+  });
+
+  return { summary: response.text.trim() };
+}
+
+// ── Aggregate summary ─────────────────────────────────────────────────────────
+
+export interface AggregateSummaryInput {
+  /** All changes in the diff as serialized JSON */
+  changesJson: string;
+  /** Human-readable artboard name, e.g. "Homepage Hero" */
+  artboardName: string;
+  /** Active DLF as JSON string — used to flag rule violations in the summary */
+  dlfJson?: string;
+}
+
+export interface AggregateSummaryOutput {
+  summary: string;
+}
+
+/**
+ * Generates a 2-3 sentence summary of ALL changes across a single diff
+ * (artboard-level granularity, suitable for the diff card header and PR body).
+ * Uses buildAggregateSummaryMessages — the session-level counterpart of
+ * buildDiffSummaryMessages (component-level).
+ */
+export async function generateAggregateSummary(
+  gateway: AIGateway,
+  input: AggregateSummaryInput,
+): Promise<AggregateSummaryOutput> {
+  const { system, userContent, maxTokens } = buildAggregateSummaryMessages({
+    changesJson:  input.changesJson,
+    artboardName: input.artboardName,
+    ...(input.dlfJson !== undefined ? { dlfJson: input.dlfJson } : {}),
+  });
+
+  const response = await gateway.complete({
+    system,
+    messages:    [{ role: 'user', content: userContent }],
+    maxTokens,
+    temperature: 0.2,  // same as per-component summary — deterministic aggregate
   });
 
   return { summary: response.text.trim() };