diff --git a/migrations/1780057136.sh b/migrations/1780057136.sh
new file mode 100644
index 00000000..1e6a8c10
--- /dev/null
+++ b/migrations/1780057136.sh
@@ -0,0 +1,172 @@
+echo "Make Shift+Enter distinguishable for terminals and Codex"
+
+alacritty_config="$HOME/.config/alacritty/alacritty.toml"
+foot_config="$HOME/.config/foot/foot.ini"
+ghostty_config="$HOME/.config/ghostty/config"
+kitty_config="$HOME/.config/kitty/kitty.conf"
+
+ensure_alacritty_shift_return() {
+  local config="$1"
+
+  [[ -f $config ]] || return 0
+
+  if grep -q 'key = "Return", mods = "Shift", chars = "\\u001B\\r"' "$config"; then
+    sed -i 's/{ key = "Return", mods = "Shift", chars = "\\u001B\\r" }/{ key = "Return", mods = "Shift", chars = "\\u001B[13;2u" }/' "$config"
+  elif ! grep -q 'key = "Return", mods = "Shift", chars = "\\u001B\[13;2u"' "$config"; then
+    if grep -qxF '{ key = "Return", mods = "Alt|Shift", chars = "\u001B[13;4u" }' "$config"; then
+      sed -i '/^{ key = "Return", mods = "Alt|Shift", chars = "\\u001B\[13;4u" }$/i # Send Shift+Return as CSI-u so TUIs can distinguish it from Return without treating it as Alt+Return.\n{ key = "Return", mods = "Shift", chars = "\\u001B[13;2u" },' "$config"
+    elif grep -qxF '{ key = "Insert", mods = "Control", action = "Copy" },' "$config"; then
+      sed -i '/^{ key = "Insert", mods = "Control", action = "Copy" },$/a # Send Shift+Return as CSI-u so TUIs can distinguish it from Return without treating it as Alt+Return.\n{ key = "Return", mods = "Shift", chars = "\\u001B[13;2u" },' "$config"
+    else
+      printf '\n# Send Shift+Return as CSI-u so TUIs can distinguish it from Return without treating it as Alt+Return.\n{ key = "Return", mods = "Shift", chars = "\\u001B[13;2u" }\n' >>"$config"
+    fi
+  fi
+}
+
+ensure_ghostty_binding() {
+  local config="$1"
+  local key="$2"
+  local binding="$3"
+  local comment="$4"
+  local key_regex
+
+  [[ -f $config ]] || return 0
+
+  key_regex=$(printf '%s\n' "$key" | sed 's/[][\\.^$*+?{}|()\/]/\\&/g')
+
+  if grep -Eq "^keybind = $key_regex=.*13;[24]u" "$config"; then
+    sed -i "s/^keybind = $key_regex=.*/keybind = $key=$binding/" "$config"
+  elif ! grep -qF "keybind = $key=" "$config"; then
+    if grep -qxF 'keybind = control+insert=copy_to_clipboard' "$config"; then
+      sed -i "/^keybind = control+insert=copy_to_clipboard$/a $comment\nkeybind = $key=$binding" "$config"
+    else
+      printf '\n%s\nkeybind = %s=%s\n' "$comment" "$key" "$binding" >>"$config"
+    fi
+  fi
+}
+
+ensure_kitty_binding() {
+  local config="$1"
+  local key="$2"
+  local binding="$3"
+  local comment="$4"
+  local key_regex
+  local tmp
+
+  [[ -f $config ]] || return 0
+
+  key_regex=$(printf '%s\n' "$key" | sed 's/[][\\.^$*+?{}|()\/]/\\&/g')
+
+  if grep -Eq "^map[[:space:]]+$key_regex[[:space:]].*13;[24]u" "$config"; then
+    tmp=$(mktemp)
+    KEY="$key" BINDING="$binding" awk '
+      BEGIN {
+        key = ENVIRON["KEY"]
+        binding = ENVIRON["BINDING"]
+      }
+      {
+        split($0, parts, /[[:space:]]+/)
+        if (parts[1] == "map" && parts[2] == key && $0 ~ /13;[24]u/) {
+          $0 = "map " key " " binding
+        }
+        print
+      }
+    ' "$config" >"$tmp" && mv "$tmp" "$config"
+  elif ! grep -Eq "^map[[:space:]]+$key_regex[[:space:]]" "$config"; then
+    if grep -qxF 'map shift+insert paste_from_clipboard' "$config"; then
+      tmp=$(mktemp)
+      KEY="$key" BINDING="$binding" COMMENT="$comment" awk '
+        BEGIN {
+          key = ENVIRON["KEY"]
+          binding = ENVIRON["BINDING"]
+          comment = ENVIRON["COMMENT"]
+        }
+        { print }
+        !inserted && $0 == "map shift+insert paste_from_clipboard" {
+          print comment
+          print "map " key " " binding
+          inserted = 1
+        }
+      ' "$config" >"$tmp" && mv "$tmp" "$config"
+    else
+      printf '\n%s\nmap %s %s\n' "$comment" "$key" "$binding" >>"$config"
+    fi
+  fi
+}
+
+ensure_foot_text_binding() {
+  local config="$1"
+  local sequence="$2"
+  local binding="$3"
+  local comment="$4"
+  local tmp
+
+  [[ -f $config ]] || return 0
+
+  if grep -qF "$sequence=" "$config"; then
+    tmp=$(mktemp)
+    SEQUENCE="$sequence" BINDING="$binding" awk '
+      BEGIN {
+        sequence = ENVIRON["SEQUENCE"]
+        binding = ENVIRON["BINDING"]
+      }
+      index($0, sequence "=") == 1 { $0 = sequence "=" binding }
+      { print }
+    ' "$config" >"$tmp" && mv "$tmp" "$config"
+  elif grep -qxF '[text-bindings]' "$config"; then
+    tmp=$(mktemp)
+    SEQUENCE="$sequence" BINDING="$binding" COMMENT="$comment" awk '
+      BEGIN {
+        sequence = ENVIRON["SEQUENCE"]
+        binding = ENVIRON["BINDING"]
+        comment = ENVIRON["COMMENT"]
+      }
+      { print }
+      !inserted && $0 == "[text-bindings]" {
+        print comment
+        print sequence "=" binding
+        inserted = 1
+      }
+    ' "$config" >"$tmp" && mv "$tmp" "$config"
+  else
+    printf '\n[text-bindings]\n%s\n%s=%s\n' "$comment" "$sequence" "$binding" >>"$config"
+  fi
+}
+
+ensure_alacritty_shift_return "$alacritty_config"
+
+ensure_ghostty_binding \
+  "$ghostty_config" \
+  "shift+enter" \
+  "csi:13;2u" \
+  "# Send Shift+Enter as CSI-u so TUIs can distinguish it from Enter."
+
+ensure_ghostty_binding \
+  "$ghostty_config" \
+  "alt+shift+enter" \
+  "csi:13;4u" \
+  "# Legacy encoding sends Alt+Shift+Enter the same as Alt+Enter; send CSI-u so tmux can match M-S-Enter."
+
+ensure_kitty_binding \
+  "$kitty_config" \
+  "shift+enter" \
+  "send_text all \\e[13;2u" \
+  "# Send Shift+Enter as CSI-u so TUIs can distinguish it from Enter."
+
+ensure_kitty_binding \
+  "$kitty_config" \
+  "alt+shift+enter" \
+  "send_text all \\e[13;4u" \
+  "# Kitty legacy encoding sends Alt+Shift+Enter the same as Alt+Enter; send CSI-u so tmux can match M-S-Enter."
+
+ensure_foot_text_binding \
+  "$foot_config" \
+  "\\x1b[13;2u" \
+  "Shift+Return" \
+  "# Send Shift+Return as CSI-u so TUIs can distinguish it from Return."
+
+ensure_foot_text_binding \
+  "$foot_config" \
+  "\\x1b[13;4u" \
+  "Mod1+Shift+Return" \
+  "# Send Alt+Shift+Return as CSI-u so tmux can match M-S-Enter."
diff --git a/test/shell.d/terminal-keybinding-migration-test.sh b/test/shell.d/terminal-keybinding-migration-test.sh
new file mode 100644
index 00000000..04a4c373
--- /dev/null
+++ b/test/shell.d/terminal-keybinding-migration-test.sh
@@ -0,0 +1,59 @@
+#!/bin/bash
+
+source "$(dirname "${BASH_SOURCE[0]}")/base-test.sh"
+
+migration=$(grep -rl 'Make Shift+Enter distinguishable for terminals and Codex' "$ROOT/migrations" | head -n 1 || true)
+[[ -n $migration ]] || fail "terminal Shift+Enter migration exists"
+
+TMPDIR=$(mktemp -d)
+trap 'rm -rf "$TMPDIR"' EXIT
+
+test_home="$TMPDIR/home"
+mkdir -p \
+  "$test_home/.config/alacritty" \
+  "$test_home/.config/foot" \
+  "$test_home/.config/ghostty" \
+  "$test_home/.config/kitty"
+
+cp "$ROOT/config/alacritty/alacritty.toml" "$test_home/.config/alacritty/alacritty.toml"
+sed -i 's/\\u001B\[13;2u/\\u001B\\r/' "$test_home/.config/alacritty/alacritty.toml"
+
+cp "$ROOT/config/kitty/kitty.conf" "$test_home/.config/kitty/kitty.conf"
+sed -i '/shift+enter/d' "$test_home/.config/kitty/kitty.conf"
+
+cp "$ROOT/config/ghostty/config" "$test_home/.config/ghostty/config"
+sed -i '/shift+enter/d' "$test_home/.config/ghostty/config"
+
+cp "$ROOT/config/foot/foot.ini" "$test_home/.config/foot/foot.ini"
+sed -i '/text-bindings/,$d' "$test_home/.config/foot/foot.ini"
+
+HOME="$test_home" bash "$migration" >/dev/null
+
+grep -qxF '{ key = "Return", mods = "Shift", chars = "\u001B[13;2u" },' "$test_home/.config/alacritty/alacritty.toml" ||
+  fail "migration updates Alacritty Shift+Return to CSI-u"
+pass "migration updates Alacritty Shift+Return to CSI-u"
+
+grep -qxF 'map shift+enter send_text all \e[13;2u' "$test_home/.config/kitty/kitty.conf" ||
+  fail "migration adds Kitty Shift+Enter CSI-u binding"
+grep -qxF 'map alt+shift+enter send_text all \e[13;4u' "$test_home/.config/kitty/kitty.conf" ||
+  fail "migration adds Kitty Alt+Shift+Enter CSI-u binding"
+pass "migration adds Kitty CSI-u bindings"
+
+grep -qxF 'keybind = shift+enter=csi:13;2u' "$test_home/.config/ghostty/config" ||
+  fail "migration adds Ghostty Shift+Enter CSI-u binding"
+grep -qxF 'keybind = alt+shift+enter=csi:13;4u' "$test_home/.config/ghostty/config" ||
+  fail "migration adds Ghostty Alt+Shift+Enter CSI-u binding"
+pass "migration adds Ghostty CSI-u bindings"
+
+grep -qxF '\x1b[13;2u=Shift+Return' "$test_home/.config/foot/foot.ini" ||
+  fail "migration adds Foot Shift+Return CSI-u binding"
+grep -qxF '\x1b[13;4u=Mod1+Shift+Return' "$test_home/.config/foot/foot.ini" ||
+  fail "migration adds Foot Alt+Shift+Return CSI-u binding"
+pass "migration adds Foot CSI-u bindings"
+
+before=$(find "$test_home/.config" -type f -print0 | sort -z | xargs -0 sha256sum)
+HOME="$test_home" bash "$migration" >/dev/null
+after=$(find "$test_home/.config" -type f -print0 | sort -z | xargs -0 sha256sum)
+
+[[ $before == "$after" ]] || fail "terminal Shift+Enter migration is idempotent"
+pass "terminal Shift+Enter migration is idempotent"