story-206: default to claude-code-pty on first use

Squash merge of feature/story-206

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/CodeRef.test.tsx

@@ -13,20 +13,31 @@ describe("parseCodeRefs (Story 193)", () => {
 	it("returns a single text part for plain text with no code refs", () => {
 		const parts = parseCodeRefs("Hello world, no code here");
 		expect(parts).toHaveLength(1);
-		expect(parts[0]).toEqual({ type: "text", value: "Hello world, no code here" });
+		expect(parts[0]).toEqual({
+			type: "text",
+			value: "Hello world, no code here",
+		});
 	});
 
 	it("detects a simple code reference", () => {
 		const parts = parseCodeRefs("src/main.rs:42");
 		expect(parts).toHaveLength(1);
-		expect(parts[0]).toMatchObject({ type: "ref", path: "src/main.rs", line: 42 });
+		expect(parts[0]).toMatchObject({
+			type: "ref",
+			path: "src/main.rs",
+			line: 42,
+		});
 	});
 
 	it("detects a code reference embedded in surrounding text", () => {
 		const parts = parseCodeRefs("See src/lib.rs:100 for details");
 		expect(parts).toHaveLength(3);
 		expect(parts[0]).toEqual({ type: "text", value: "See " });
-		expect(parts[1]).toMatchObject({ type: "ref", path: "src/lib.rs", line: 100 });
+		expect(parts[1]).toMatchObject({
+			type: "ref",
+			path: "src/lib.rs",
+			line: 100,
+		});
 		expect(parts[2]).toEqual({ type: "text", value: " for details" });
 	});