Increment 6: final verification + docs

- Full XCTest suite green (55 tests)
- Visual verification of all tabs (screenshots): Processes (Energy/Disk columns +
  live data), Performance (range picker + P/E core charts), Power & Storage
  (Health score 55/Fair + battery 97%/114 cycles + preserved System/GPU)
- Ground-truth cross-checks: memory 12.31GB vs 12.53GB reported (16KB pages),
  battery vs ioreg/pmset, per-process CPU vs ps, disk vs df — all consistent
- README updated to document new capabilities; testing docs referenced

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

@@ -29,10 +29,13 @@ A native macOS system monitor application built with SwiftUI. TopManager provide
 ## Features
 
 ### Processes Tab
-- View all running processes with CPU, memory, and thread information
-- Sort by any column (name, PID, CPU%, memory, threads, user, state)
+- View all running processes with CPU, memory, thread, **energy-impact**, and
+  **per-process disk I/O** information
+- Sort by any column (name, PID, CPU/Core, CPU/Total, Energy, memory, Disk I/O, threads, user, state)
 - Process states: Running, Sleeping, Stopped, Zombie
 - Context menu to terminate, force kill, suspend, or resume processes
+- **Deep-dive inspector** (double-click / ⌘I): full executable path, launch
+  arguments, open-file count, disk totals, energy, parent PID, Reveal in Finder
 - Search processes by name or PID
 
 ### Apps Tab
@@ -43,17 +46,38 @@ A native macOS system monitor application built with SwiftUI. TopManager provide
 
 ### Performance Tab
 - Real-time CPU usage graphs (global and per-core)
+- **Selectable time range** (Live / 5m / 30m / 1h / 24h) backed by persistent history
 - Memory usage visualization with donut chart
 - Network throughput monitoring
 - Support for Apple Silicon P-cores and E-cores
 
 ### Power & Storage Tab
+- **System Health score (0–100)** with plain-language diagnosis of what's wrong
+- **Recent Alerts** inbox
+- **Battery & Power**: charge, health (cycle-adjusted), cycle count, condition,
+  temperature, power draw, time remaining, adapter wattage (via IOKit)
 - System status: macOS version, uptime, thermal state
 - CPU and GPU core counts
 - GPU memory/VRAM usage
 - Storage volumes with usage bars
 - Network interface statistics
 
+### Proactive monitoring
+- **Alerts engine** with native macOS notifications on sustained high CPU,
+  critical memory pressure, disk almost full, thermal throttling, runaway
+  processes, and low battery — de-duplicated so you're never spammed
+- **Persistent metric history** stored to disk; trends survive restarts
+
+### Menu Bar
+- Configurable menu-bar metric (CPU % / Memory % / Health / Download)
+- Dropdown with live CPU/memory/network/GPU/battery, System Health score, and
+  **Top CPU Consumers** with one-click quit
+
+### Settings (⌘,)
+- **Launch at login** (SMAppService)
+- Adjustable refresh interval (1–30 s)
+- Notification toggle and alert thresholds (CPU, disk, low battery)
+
 ## Requirements
 
 - macOS 13.0 or later
@@ -74,10 +98,20 @@ A native macOS system monitor application built with SwiftUI. TopManager provide
 
 This project is licensed under the GNU General Public License v3.0 - see the [LICENSE](LICENSE) file for details.
 
+## Testing
+
+Logic is covered by an XCTest suite (`TopManagerTests`, 55 tests) run via
+`scripts/test.sh test`. The full manual + automated process is documented in
+[docs/TESTING.md](docs/TESTING.md), and the product direction in
+[docs/VALUE_PLAN.md](docs/VALUE_PLAN.md).
+
 ## Acknowledgments
 
 Built with SwiftUI and native macOS APIs including:
-- `libproc` for process information
-- `IOKit` for GPU and hardware monitoring
+- `libproc` / `rusage_info` for process information, disk I/O and energy signals
+- `IOKit` for GPU, battery (AppleSmartBattery) and hardware monitoring
 - `Metal` for GPU detection
 - `SystemConfiguration` for network monitoring
+- `UserNotifications` for proactive alerts
+- `ServiceManagement` (SMAppService) for launch-at-login
+- Swift `Charts` for time-series visualization