Address PR review feedback on TOML config tests

Remove invalid-prefix.toml and unknown-section.toml fixtures that
don't actually test client-side validation (prefix isn't validated,
unknown sections pass through via .passthrough()). Add error message
assertion to invalid TOML tests, bump dev test timeout to 6 min,
and make quit-key assertion more specific.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ryancbahan

packages/e2e/data/invalid-tomls/invalid-prefix.toml

@@ -37,6 +37,7 @@ test.describe('TOML config invalid', () => {
         const output = result.stdout + result.stderr
         console.log(`[${label}] exit code: ${result.exitCode}\n[${label}] output:\n${output}`)
         expect(result.exitCode, `expected deploy to fail for ${label}, but it succeeded:\n${output}`).not.toBe(0)
+        expect(output.toLowerCase(), `expected error output for ${label}:\n${output}`).toMatch(/error|invalid|failed/)
       } finally {
         fs.rmSync(appDir, {recursive: true, force: true})
       }

packages/e2e/data/invalid-tomls/unknown-section.toml

@@ -15,7 +15,7 @@ test.describe('TOML config regression', () => {
   })
 
   test('dev starts with fully populated toml', async ({cli, env, tomlAppDir}) => {
-    test.setTimeout(5 * 60 * 1000)
+    test.setTimeout(6 * 60 * 1000)
     requireEnv(env, 'clientId', 'storeFqdn')
 
     const proc = await cli.spawn(['app', 'dev', '--path', tomlAppDir], {
@@ -26,7 +26,7 @@ test.describe('TOML config regression', () => {
       await proc.waitForOutput('Ready, watching for changes in your app', 3 * 60 * 1000)
 
       const output = proc.getOutput()
-      expect(output).toContain('q')
+      expect(output).toMatch(/q\s*[│|]\s*quit/i)
 
       proc.sendKey('q')
       const exitCode = await proc.waitForExit(30_000)