test: rebuild the view-skeleton suite on ADR 0009 tiers (task 0003)

Guard the CLI entry's program.parse() behind import.meta.main so the
command module can be imported without running the CLI, then rebuild the
deleted suite across the three tiers ADR 0009 defines:

- unit: parse (core) and render (bin), asserted on return values
- integration: the view command function, asserted on its Result
- e2e: the kitchen binary as a subprocess (exit codes, streams, ANSI
  suppression, errors, --help)

Drop the stale test-support.ts coverage ignore and refresh the task's
implementation notes to describe the tiered suite.

packages/bin/src/index_test.ts

@@ -0,0 +1,65 @@
+import { describe, expect, test } from "bun:test";
+import { join } from "node:path";
+
+const repoRoot = join(import.meta.dir, "..", "..", "..");
+const entry = join(repoRoot, "packages", "bin", "src", "index.ts");
+
+async function runKitchen(args: string[]) {
+  const proc = Bun.spawn(["bun", entry, ...args], {
+    cwd: repoRoot,
+    stdout: "pipe",
+    stderr: "pipe",
+  });
+  const [stdout, stderr] = await Promise.all([
+    new Response(proc.stdout).text(),
+    new Response(proc.stderr).text(),
+  ]);
+  const exitCode = await proc.exited;
+  return { exitCode, stdout, stderr };
+}
+
+describe("kitchen CLI (e2e)", () => {
+  test("view renders a recipe file to stdout and exits 0", async () => {
+    const { exitCode, stdout, stderr } = await runKitchen(["view", "fixtures/prose.md"]);
+    const out = Bun.stripANSI(stdout);
+    expect(exitCode).toBe(0);
+    expect(stderr).toBe("");
+    expect(out).toContain("Buttered Toast");
+    expect(out).toContain("Method");
+    expect(out).toContain("Serving");
+    expect(out).toContain("Cut into triangles and serve at once.");
+  });
+
+  test("view preserves document order in the output", async () => {
+    const { stdout } = await runKitchen(["view", "fixtures/prose.md"]);
+    const out = Bun.stripANSI(stdout);
+    expect(out.indexOf("Method")).toBeLessThan(out.indexOf("Serving"));
+  });
+
+  test("ANSI styling is suppressed when stdout is not a TTY (piped)", async () => {
+    const { stdout } = await runKitchen(["view", "fixtures/prose.md"]);
+    expect(stdout).not.toContain("\x1b");
+  });
+
+  test("a nonexistent file prints a human-readable error to stderr and exits 1", async () => {
+    const { exitCode, stdout, stderr } = await runKitchen(["view", "does/not/exist.md"]);
+    expect(exitCode).toBe(1);
+    expect(stdout).toBe("");
+    expect(stderr).toContain("cannot read");
+    expect(stderr).toContain("does/not/exist.md");
+    expect(stderr.startsWith("kitchen:")).toBe(true);
+  });
+
+  test("a missing file argument prints usage to stderr and exits 1", async () => {
+    const { exitCode, stderr } = await runKitchen(["view"]);
+    expect(exitCode).toBe(1);
+    expect(stderr).not.toBe("");
+    expect(stderr.toLowerCase()).toContain("missing required argument");
+  });
+
+  test("--help lists the view command and exits 0", async () => {
+    const { exitCode, stdout } = await runKitchen(["--help"]);
+    expect(exitCode).toBe(0);
+    expect(stdout).toContain("view");
+  });
+});