feat(#18): detect Zed as a host editor

Adds Zed to notify.sh's editor-detection layer so notifications fired from
agents running inside Zed's integrated terminal route correctly:

- TERM_PROGRAM=zed → bundle ID dev.zed.Zed (Zed sets this env var since
  zed-industries/zed#14213, merged 2024-07).
- bundle ID dev.zed.Zed → process name Zed (used by System Events for
  window-title capture and frontmost-window suppression).
- Adds Zed to walk_session_chain's terminal-app match list so the panel's
  session view records Zed correctly when walking the process tree.

Zed has no external hook system of its own (hooks are not supported in
external agents — see Zed docs), so stack-nudge relies on the agent's
own hooks (e.g. ~/.claude/settings.json) firing from inside Zed's
terminal. The agent-side wiring is already auto-detected by install.sh;
this PR only adds the editor-side recognition for click-to-focus and
mute-when-focused suppression.

README updated with the supported-apps list + a note explaining the
hook flow for Zed users.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: StuBehan

README.md

@@ -53,11 +53,13 @@ The hook calls `notify.sh <agent> <event>`, which plays a sound and shows a bann
 
 When you click the banner, `stack-nudge.app` uses System Events to raise the exact window that triggered the notification — even if you have multiple Cursor or terminal windows open. Supported apps:
 
-- Cursor, VS Code
+- Cursor, VS Code, Zed
 - iTerm2, Warp, Ghostty, Terminal.app
 
 If the target app is already in focus when the notification fires, the banner is suppressed and only the sound plays.
 
+> **Note on Zed:** Zed itself doesn't expose an external hook system, so stack-nudge relies on the agent's hooks (e.g. `~/.claude/settings.json` for Claude Code) firing from inside Zed's integrated terminal. Click-to-focus and frontmost-window suppression are wired up via `TERM_PROGRAM=zed`, which Zed sets automatically.
+
 ### Immediate focus mode
 
 If you'd rather have your editor focus automatically — no click needed:

notify.sh

@@ -268,6 +268,7 @@ walk_session_chain() {
     case "$base" in
       "Code Helper"|"Code Helper (Plugin)"|"Code Helper (Renderer)"|Code|\
       "Cursor Helper"|"Cursor Helper (Plugin)"|"Cursor Helper (Renderer)"|Cursor|\
+      Zed|zed|\
       iTerm2|iTerm|Terminal|Warp|WarpTerminal|ghostty|Ghostty)
         TERMINAL_PID="$pid"; TERMINAL_APP="$base"; break ;;
     esac
@@ -356,7 +357,8 @@ notify_macos() {
   local sound="$3"
   local voice_message="${4:-$message}"
 
-  # Detect terminal / editor bundle ID for click-to-focus
+  # Detect terminal / editor bundle ID for click-to-focus.
+  # Zed sets TERM_PROGRAM=zed in its integrated terminal as of zed-industries/zed#14213.
   local bundle_id
   case "${TERM_PROGRAM}" in
     vscode)
@@ -366,6 +368,7 @@ notify_macos() {
         bundle_id="com.microsoft.VSCode"
       fi
       ;;
+    zed)          bundle_id="dev.zed.Zed" ;;
     iTerm.app)    bundle_id="com.googlecode.iterm2" ;;
     WarpTerminal) bundle_id="dev.warp.Warp-Stable" ;;
     ghostty)      bundle_id="com.mitchellh.ghostty" ;;
@@ -377,6 +380,7 @@ notify_macos() {
   case "$bundle_id" in
     com.todesktop.230313mzl4w4u92) process_name="Cursor" ;;
     com.microsoft.VSCode)           process_name="Code" ;;
+    dev.zed.Zed)                    process_name="Zed" ;;
     com.googlecode.iterm2)          process_name="iTerm2" ;;
     dev.warp.Warp-Stable)           process_name="Warp" ;;
     com.mitchellh.ghostty)          process_name="Ghostty" ;;