### System details

Especificações do Sistema                                                                                                                                                                                                                                             ┌────────────────┬────────────────────────────────────────────────┐                                                                │ Componente     │ Detalhes                                       │                                                                ├────────────────┼────────────────────────────────────────────────┤                                                                │ CPU            │ AMD Ryzen 3 PRO 2200G com Radeon Vega Graphics │                                                                ├────────────────┼────────────────────────────────────────────────┤                                                                │ Cores/Threads  │ 4 cores / 4 threads (1 thread por core)        │                                                                ├────────────────┼────────────────────────────────────────────────┤                                                                │ Clock          │ Base 1.6 GHz · Boost 3.7 GHz · Atual ~1.56 GHz │                                                                ├────────────────┼────────────────────────────────────────────────┤                                                                │ Socket         │ AM4                                            │                                                                ├────────────────┼────────────────────────────────────────────────┤                                                                │ Placa-mãe      │ Gigabyte B450M DS3H-CF (rev "Default string")  │                                                                ├────────────────┼────────────────────────────────────────────────┤                                                                │ BIOS           │ AMI F67a (04/11/2024)                          │                                                                ├────────────────┼────────────────────────────────────────────────┤                                                                │ RAM Total      │ 13.6 GiB (14.2 GB)                             │                                                                ├────────────────┼────────────────────────────────────────────────┤                                                                │ RAM Livre      │ ~4.3 GiB                                       │                                                                ├────────────────┼────────────────────────────────────────────────┤                                                                │ RAM Disponível │ ~8.5 GiB (com cache)                           │                                                                ├────────────────┼────────────────────────────────────────────────┤                                                                │ Swap           │ 27 GiB (358 MiB usado)                         │                                                                ├────────────────┼────────────────────────────────────────────────┤                                                                │ NUMA           │ Single node (node0: CPUs 0-3)                  │                                                                └────────────────┴────────────────────────────────────────────────┘                                                                                                                                                                                                   Notas:                                                                                                                             - iGPU Vega integrada (sem GPU discreta detectada)                                                                                 - DDR4 presumida (B450 suporta até 3200 MHz OC)                                                                                    - dmidecode sem detalhes de módulos DIMM (precisa sudo ou kernel sem exposição SMBIOS completa)                                  

### What's wrong?

## Bug Report: Plugin scan process fails at runtime — bar widgets (bluetooth, agents, etc.) not registered

### System Details
- **Omarchy Version:** 4.0.4-1 (stable)
- **Channel:** stable
- **Kernel:** `$(uname -r)`
- **Hyprland:** `$(hyprctl version | head -1)`
- **Quickshell:** `$(quickshell --version 2>/dev/null || echo "unknown")`

### Issue Summary
The Omarchy shell's plugin registry scan process (`scanProcess` in `PluginRegistry.qml`) fails to execute at runtime. This prevents first-party plugins (bluetooth, agents, audio, network, etc.) from being discovered and registered as bar widgets. The widgets are configured in `shell.json` and their manifests are valid, but they never appear in the top bar.

### Expected Behavior
- On shell startup, `PluginRegistry.rescan()` runs the scan script
- Scan script outputs `===firstparty::...===` and `===thirdparty::...===` blocks for each plugin
- `parseScanOutput` populates `installedPlugins` 
- `onScanFinished` triggers `syncPluginWidgets()`
- Widgets with `kinds: ["bar-widget"]` are loaded via `Qt.createComponent()` and registered in `BarWidgetRegistry`
- Bluetooth widget (and others) appear in the bar

### Actual Behavior
- No `===firstparty::...===` or `===thirdparty::...===` output in quickshell logs
- `installedPlugins` remains empty
- `syncPluginWidgets()` has nothing to register
- Bluetooth widget missing from bar despite being in `bar.layout.right`
- Other first-party widgets also missing (agents, etc.)

### Evidence: Bluetooth Backend Works Perfectly
```bash
$ systemctl status bluetooth
● bluetooth.service - Bluetooth service
     Active: active (running)

$ bluetoothctl show
Controller 04:7F:0E:0F:CA:B3 (public)
	Powered: yes

$ bluetoothctl info EC:4D:5E:6E:CD:B0
Device EC:4D:5E:6E:CD:B0 (public)
	Name: RS56
	Connected: yes
	Battery Percentage: 0x14 (20)
```

Quickshell logs show Bluetooth C++ backend working:
```
Tracked new adapter BluetoothAdapter(0x..., path="/org/bluez/hci0")
Updated property org.bluez/.../PowerState to qs::bluetooth::BluetoothAdapterState::Enabled
Tracked new device BluetoothDevice(0x..., path="/org/bluez/hci0/dev_EC_4D_5E_6E_CD_B0")
Added device ... to adapter ...
```

### Root Cause Analysis
In `/usr/share/omarchy/shell/services/PluginRegistry.qml`, the `rescan()` function assigns a long multi-line bash script string to `scanProcess.command`:

```qml
function rescan() {
  if (scanning) return
  scanning = true
  var script = ""
    + "emit_manifest() { ... }; "
    + "scan_firstparty() { ... }; "
    + "scan_thirdparty() { ... }; "
    + "scan_firstparty \"$0\"; "
    + "scan_thirdparty \"$1\""
  scanProcess.command = ["bash", "-c", script, registry.firstPartyDir, registry.pluginsDir]
  scanProcess.running = true
}
```

The `Process` component (from `Quickshell.Io`) fails to start when `command` is assigned a long dynamic string at runtime. Other `Process` components in the same file work fine:
- `localPluginWatcher` (inotifywait) — simple command, works
- `initProcess` (mkdir -p) — simple command, works

Manual execution of the exact same script works perfectly:
```bash
$ bash -c '...scan script...' /usr/share/omarchy/shell/plugins /home/gui/.config/omarchy/plugins
===firstparty::/usr/share/omarchy/shell/plugins/panels/bluetooth===
{ "id": "omarchy.bluetooth", "kinds": ["bar-widget"], ... }
=== EOM ===
...
(1022 lines total, 20+ plugins discovered)
```

### Shell Config (shell.json)
```json
{
  "bar": {
    "layout": {
      "right": [
        { "id": "omarchy.tray" },
        { "id": "tzglobic.monitor-arranger" },
        { "id": "omarchy.agents" },
        { "id": "omarchy.bluetooth" },   // ← configured but not rendered
        { "id": "omarchy.network" },
        { "id": "omarchy.audio" }
      ]
    }
  }
}
```

### Reproduction Steps
1. Fresh Omarchy install (4.0.4-1)
2. Login to Hyprland session
3. Observe top bar — bluetooth widget missing
4. Check quickshell logs: `strings /run/user/1000/quickshell/by-id/*/log.qslog | grep "===firstparty"`
5. No scan output found
6. Run `omarchy shell shell rescanPlugins` — no effect
7. Run `omarchy restart shell` — no effect

### Proposed Fix
Move the scan script to an external file and execute it:

**1. Create `/usr/share/omarchy/shell/services/scan-plugins.sh`:**
```bash
#!/bin/bash
set -euo pipefail

emit_manifest() {
  local kind="$1"; local manifest="$2"; local sub
  if [[ ${manifest##*/} == "manifest.json" ]]; then sub="${manifest%/manifest.json}"; else sub="$(dirname -- "$manifest")"; fi
  printf '===%s::%s===\n' "$kind" "$sub"
  cat "$manifest"
  printf '\n=== EOM ===\n'
}

scan_firstparty() {
  local dir="$1"; [[ -d "$dir" ]] || return 0
  while IFS= read -r manifest; do emit_manifest firstparty "$manifest"; done < <(find "$dir" -mindepth 2 -maxdepth 3 -type f \( -name manifest.json -o -name '*.manifest.json' \) | sort)
}

scan_thirdparty() {
  local dir="$1"; [[ -d "$dir" ]] || return 0
  for sub in "$dir"/*/; do [[ -f "$sub/manifest.json" ]] || continue; emit_manifest thirdparty "$sub/manifest.json"; done
}

scan_firstparty "$1"
scan_thirdparty "$2"
```

**2. Update `PluginRegistry.qml` `rescan()`:**
```qml
function rescan() {
  if (scanning) return
  scanning = true
  var scriptPath = "/usr/share/omarchy/shell/services/scan-plugins.sh"
  scanProcess.command = ["bash", scriptPath, registry.firstPartyDir, registry.pluginsDir]
  scanProcess.running = true
}
```

### Workaround (User-level)
```bash
omarchy hook install startup 'sleep 3 && omarchy restart shell'
```
(Sometimes works if user plugin dir exists at startup)

### Related Files
- `/usr/share/omarchy/shell/services/PluginRegistry.qml` (lines ~715-730)
- `/usr/share/omarchy/shell/shell.qml` (lines ~1440-1500, `syncPluginWidgets`, `onScanFinished`)
- `/usr/share/omarchy/shell/plugins/panels/bluetooth/manifest.json`
- `/usr/share/omarchy/shell/plugins/panels/bluetooth/Panel.qml`

---

**This is a critical bug affecting all first-party bar widgets on fresh installs. The Bluetooth backend works; only the widget registration pipeline is broken.**