refactor: remove bash pty mode

docs/bash.md

@@ -12,18 +12,10 @@ Run shell commands in the workspace. Supports foreground + background execution
 ## Parameters
 
 - `command` (required)
-- `yieldMs` (default 20000): auto-background after delay
+- `yieldMs` (default 10000): auto-background after delay
 - `background` (bool): background immediately
 - `timeout` (seconds, default 1800): kill on expiry
-- `stdinMode` (`pipe` | `pty`):
-  - `pipe` (default): classic stdin/stdout/stderr pipes
-  - `pty`: real TTY via node-pty (merged stdout/stderr)
-
-## TTY mode (`stdinMode: "pty"`)
-
-- Uses node-pty if available. If node-pty fails to load/start, the tool warns and falls back to `pipe`.
-- Output streams are merged (no separate stderr).
-- `process write` sends raw input; `eof: true` sends Ctrl-D (`\x04`).
+- Need a real TTY? Use the tmux skill.
 
 ## Examples
 
@@ -37,8 +29,3 @@ Background + poll:
 {"tool":"bash","command":"npm run build","yieldMs":1000}
 {"tool":"process","action":"poll","sessionId":"<id>"}
 ```
-
-TTY command:
-```json
-{"tool":"bash","command":"htop","stdinMode":"pty","background":true}
-```