fix(cli): eliminate ghost status-bar + DSR input leaks from terminal drift

The CLI renders through prompt_toolkit in non-full-screen mode, so every
repaint uses the renderer's tracked _cursor_pos.y to cursor_up() + erase
before drawing the new frame. Any time that tracked position drifts from
terminal reality, redraws stack on top of stale content instead of
overwriting it. Four user-visible bugs share this root cause.

Fixes:

- #5474 (SIGWINCH ghosts): the resize wrapper previously only handled
  column-shrink reflow. Generalize it to force a full screen-clear
  (erase_screen + cursor_goto(0,0)) and renderer.reset() on every resize
  — covers widen, row-shrink, and multiplexer SIGWINCH-less redraws.

- #8688 (cmux/tmux tab switch): no SIGWINCH fires on focus regain, so
  prompt_toolkit has no signal to recover. Add a _force_full_redraw()
  helper, bound to Ctrl+L (standard bash/zsh/vim convention) and exposed
  as /redraw. Users can manually clear drift without restarting Hermes.

- #14692 (DSR response leaks — ^[[53;1R): resize storms make
  prompt_toolkit's CSI 6n queries race past the input parser; the
  terminal's reply ends up as literal input text. Add a sibling of the
  bracketed-paste sanitizer that strips \x1b[<row>;<col>R and the
  caret-escape visible form from paste text, buffer text-filter, and
  the input-processing loop.

The idle-redraw removal (#12641) is in the preceding commit from
@foxion37 — keeping them as separate commits preserves attribution.

hermes_cli/commands.py

@@ -62,6 +62,8 @@ COMMAND_REGISTRY: list[CommandDef] = [
                aliases=("reset",)),
     CommandDef("clear", "Clear screen and start a new session", "Session",
                cli_only=True),
+    CommandDef("redraw", "Force a full UI repaint (recovers from terminal drift)", "Session",
+               cli_only=True),
     CommandDef("history", "Show conversation history", "Session",
                cli_only=True),
     CommandDef("save", "Save the current conversation", "Session",