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New `rat watch <id>` subcommand: attaches over the Unix socket and
replays + tails the session's PtyOutput to stdout, but never sends
ClientMsg::Input, Detach, or Resize. The interactive attacher (if
any) is completely untouched.
Implementation notes:
- Stays in cooked mode so the terminal's line discipline handles
Ctrl-C → SIGINT cleanly, which the tokio signal task traps and
uses to notify the read loop to exit.
- Reuses OutputFilter so keyboard-protocol enables from inner TUIs
don't bleed into the watcher's terminal.
- Suppresses SessionEnded-based exit distinction with the shared
`print_session_ended` banner so ending a session while watching
is visually consistent with ending while attached.
Useful for pair/review ("peek without risk of typing"), CI-style
monitoring via `rat watch x > log`, or any tool that wants a live
byte stream from a session without the raw-mode contract of attach.
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Superseded by #11 — combined to avoid peer-merge conflict churn. Original commit preserved there. |
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Summary
`rat watch ` attaches and tails output but never sends anything back — no input, no detach, no resize. The interactive attacher is untouched.
```sh
rat watch agent # follow live
rat watch agent | tee agent.out # capture to file
```
Ctrl-C stops watching. Uses the same OutputFilter as `rat attach` to keep kitty-CSI-u enables out of the watcher's terminal.
Test plan