af send: multi-line messages (>3 lines) treated as paste, final Enter swallowed

[waleedkadous]

Bug

When af send delivers a message longer than 3 lines to a terminal, the terminal (likely xterm.js or the shell) classifies it as a paste rather than typed input. This causes the final Enter/newline to be swallowed — the message appears in the terminal but doesn't get submitted.

Steps to Reproduce

1. af send 0042 "a message that spans more than three lines"
2. Observe that the message appears in the builder's terminal but the trailing Enter doesn't fire
3. Short messages (1-3 lines) work fine

Expected Behavior

The message should be fully delivered AND submitted (Enter processed), regardless of length.

Suggested Fix

Pace the output for messages longer than 3 lines — introduce a small delay between chunks or between the message body and the final newline, so the terminal doesn't classify it as a bracketed paste.

[waleedkadous]

On it! Working on a fix now.