fix(test): add TTY method stubs for non-TTY environments in stdio tests

- Add stub methods (cursorTo, clearLine, clearScreenDown) before spying
- Prevents 'property is not defined' errors when stdout/stderr are not TTYs
- Enables tests to run in CI and non-terminal environments

Author: jdalton

test/stdio/stderr.test.ts

@@ -32,6 +32,14 @@ describe('stdio/stderr', () => {
     originalColumns = stderr.columns
     originalRows = stderr.rows
 
+    // Add TTY methods if they don't exist (for non-TTY environments)
+    if (!stderr.cursorTo) {
+      ;(stderr as any).cursorTo = () => {}
+    }
+    if (!stderr.clearLine) {
+      ;(stderr as any).clearLine = () => {}
+    }
+
     // Create spies
     writeSpy = vi.spyOn(stderr, 'write').mockImplementation(() => true)
     cursorToSpy = vi.spyOn(stderr, 'cursorTo').mockImplementation(() => {})

test/stdio/stdout.test.ts

@@ -36,6 +36,17 @@ describe('stdio/stdout', () => {
     originalColumns = stdout.columns
     originalRows = stdout.rows
 
+    // Add TTY methods if they don't exist (for non-TTY environments)
+    if (!stdout.cursorTo) {
+      ;(stdout as any).cursorTo = () => {}
+    }
+    if (!stdout.clearLine) {
+      ;(stdout as any).clearLine = () => {}
+    }
+    if (!stdout.clearScreenDown) {
+      ;(stdout as any).clearScreenDown = () => {}
+    }
+
     // Create spies
     writeSpy = vi.spyOn(stdout, 'write').mockImplementation(() => true)
     cursorToSpy = vi.spyOn(stdout, 'cursorTo').mockImplementation(() => {})