feat: add promptfoo eval harness for agent quality scoring (#371)

Adds promptfoo eval harness for agent quality scoring. LLM-as-judge system scoring task completion, instruction adherence, identity consistency, deliverable quality, and safety. Includes tests.

evals/scripts/extract-metrics.test.ts

@@ -0,0 +1,65 @@
+import { describe, it, expect } from "vitest";
+import { extractMetrics, parseAgentFile } from "./extract-metrics";
+import path from "path";
+
+describe("parseAgentFile", () => {
+  it("extracts frontmatter fields from a real agent file", () => {
+    const agentPath = path.resolve(
+      __dirname,
+      "../../engineering/engineering-backend-architect.md"
+    );
+    const result = parseAgentFile(agentPath);
+
+    expect(result.name).toBe("Backend Architect");
+    expect(result.description).toContain("backend architect");
+    expect(result.category).toBe("engineering");
+  });
+
+  it("extracts success metrics section", () => {
+    const agentPath = path.resolve(
+      __dirname,
+      "../../engineering/engineering-backend-architect.md"
+    );
+    const result = parseAgentFile(agentPath);
+
+    expect(result.successMetrics).toBeDefined();
+    expect(result.successMetrics!.length).toBeGreaterThan(0);
+    expect(result.successMetrics!.some((m) => m.includes("200ms"))).toBe(true);
+  });
+
+  it("extracts critical rules section", () => {
+    const agentPath = path.resolve(
+      __dirname,
+      "../../academic/academic-historian.md"
+    );
+    const result = parseAgentFile(agentPath);
+
+    expect(result.criticalRules).toBeDefined();
+    expect(result.criticalRules!.length).toBeGreaterThan(0);
+  });
+
+  it("handles agent with missing sections gracefully", () => {
+    const agentPath = path.resolve(
+      __dirname,
+      "../../engineering/engineering-backend-architect.md"
+    );
+    const result = parseAgentFile(agentPath);
+
+    expect(result).toHaveProperty("name");
+    expect(result).toHaveProperty("category");
+    expect(result).toHaveProperty("successMetrics");
+    expect(result).toHaveProperty("criticalRules");
+    expect(result).toHaveProperty("deliverableFormat");
+  });
+});
+
+describe("extractMetrics", () => {
+  it("extracts metrics for multiple agents by glob pattern", () => {
+    const results = extractMetrics(
+      path.resolve(__dirname, "../../engineering/engineering-backend-architect.md")
+    );
+
+    expect(results.length).toBe(1);
+    expect(results[0].name).toBe("Backend Architect");
+  });
+});