Mirrored terminal (Windows): Enter, Ctrl+C, Esc, arrows and pastes go to the pane as raw pane.send_text, never verified on Windows #257

What happens

A PC whose herdr cannot attach a terminal (Windows) gets a mirrored terminal lens. Everything typed there, both xterm's onData and the key bar, reaches the pane as pane.send_text (server/index.ts:1381-1390; MirrorSession.write at server/mirror.ts:120-123, wired at server/index.ts:509). That includes control bytes:

• Enter as \r
• Ctrl+C as \x03
• Esc as \x1b
• arrows as CSI or SS3 (src/lib/keys.ts:27-45)

Only keys frames and the composer's Enter use pane.send_keys (server/index.ts:317-321, server/index.ts:1436-1446).

Nobody has checked whether herdr on Windows turns those bytes into the right key events:

• fix(session): start Gajae Code from New session on a Windows PC #251 found that send_text behaves differently on Windows. A \n in sent text becomes a line break in PowerShell's editor (it waits at >>) instead of running the line (server/shell-agent.ts:8-9). That is why fix(session): start Gajae Code from New session on a Windows PC #251 presses Enter with send_keys.
• feat(machines): mirror a pane's screen into the terminal lens where herdr cannot attach #228 was tested on Linux with attach forced off, never on a Windows PC. The contract test sends echo …\r to a Linux herdr (server/submit.contract.test.ts:363).
• A repaint carries terminal modes only if pane.read's ansi output includes them, which has not been checked. If it does not, xterm never learns that a program turned on bracketed paste (?2004) or application cursor keys (?1). A multi-line paste could then run line by line in PowerShell or be submitted early in an agent TUI, and the key bar picks CSI or SS3 for arrows from the wrong mode.

Check on a real Windows PC

Use a separate herdr session, not one in use. In the terminal lens of a mirrored pane, in PowerShell, cmd and an agent TUI (gjc, Claude Code), try:

• Enter
• Ctrl+C on a running command
• Esc
• arrows and history
• Tab
• a multi-line paste
• Korean IME input

Ideas

• For a mirrored pane, send the control keys herdr's send_keys knows (Enter, Ctrl+C, Escape, arrows, Tab) through pane.send_keys, and keep printable runs on send_text, in order.
• Pin what the Windows check finds in a unit test of that mapping.

Found in a read-only review of Windows support. Nothing was run on a Windows PC.