fix(tui): pop keyboard flags on suspend paths too (#443 follow-up)

`main.rs` (process panic) and the normal TUI shutdown both pop
keyboard enhancement flags before handing the terminal back to
the child shell. The two suspend paths — `pause_terminal`
(Ctrl+Z and shell-suspend) and
`external_editor::spawn_editor_for_input` (composer `$EDITOR`
launch) — were missing the same defensive pop.

Today this is dormant: the TUI doesn't push keyboard
enhancement flags explicitly, so there's nothing to pop. The
fix is defence-in-depth: the day a future code path enables
the flags (kitty keyboard protocol for sub-second-precision
modifier reporting, say), the suspend handlers won't leak the
half-configured input mode to Vim / less / a shell child.

Aligns the four terminal-handoff sites (shutdown, panic,
suspend, editor) so they all do the same thing.

CHANGELOG.md

@@ -148,6 +148,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   the user-level array wholesale (the typical "merge" pattern is
   for users who want both — they list `~/global.md` inside the
   project array). Documented in `config.example.toml`.
+- **Keyboard-enhancement flags pop on suspend paths too** (#443
+  follow-up) — `pause_terminal` (Ctrl+Z / shell-suspend) and
+  `external_editor::spawn_editor_for_input` (composer `$EDITOR`
+  launch) now pop the flags before handing the terminal to the
+  child process, matching the existing shutdown and panic-hook
+  paths. Defense-in-depth: if a future code path enables the
+  flags explicitly, the suspend handlers won't leak them to a
+  Vim / less / shell child that hasn't asked for them.
 - **RLM tool family** (#512) — `rlm` tool cards map to
   `ToolFamily::Rlm` and render `rlm`, not `swarm`. Stale "swarm"
   wording cleaned out of docs / comments / tests.

crates/tui/src/tui/external_editor.rs

@@ -15,7 +15,10 @@ use std::io::{self, Stdout, Write};
 use std::process::Command;
 
 use crossterm::{
-    event::{DisableBracketedPaste, DisableMouseCapture, EnableBracketedPaste, EnableMouseCapture},
+    event::{
+        DisableBracketedPaste, DisableMouseCapture, EnableBracketedPaste, EnableMouseCapture,
+        PopKeyboardEnhancementFlags,
+    },
     execute,
     terminal::{EnterAlternateScreen, LeaveAlternateScreen, disable_raw_mode, enable_raw_mode},
 };
@@ -125,6 +128,10 @@ pub fn spawn_editor_for_input(
     current: &str,
 ) -> io::Result<EditorOutcome> {
     // 1. Suspend.
+    // #443: pop keyboard enhancement flags first so the editor
+    // process doesn't inherit a half-configured input mode. Best-
+    // effort — matches the shutdown / panic paths in main.rs.
+    let _ = execute!(terminal.backend_mut(), PopKeyboardEnhancementFlags);
     let _ = disable_raw_mode();
     if use_bracketed_paste {
         let _ = execute!(terminal.backend_mut(), DisableBracketedPaste);

crates/tui/src/tui/ui.rs

@@ -5162,6 +5162,11 @@ fn pause_terminal(
     use_mouse_capture: bool,
     use_bracketed_paste: bool,
 ) -> Result<()> {
+    // #443: pop keyboard enhancement flags before handing the terminal
+    // to a child process so it doesn't inherit a half-configured input
+    // mode. Best-effort — terminals that didn't accept the flags
+    // silently ignore the pop. Matches the shutdown and panic paths.
+    let _ = execute!(terminal.backend_mut(), PopKeyboardEnhancementFlags);
     disable_raw_mode()?;
     if use_alt_screen {
         execute!(terminal.backend_mut(), LeaveAlternateScreen)?;