docs: rewrite README for open source release

.gitignore

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+dump*
+deploy.sh
+pulsewise-collector

README.md

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+# Pulsewise Collector
+
+Lightweight system metrics collector that reports CPU, memory, disk, network, and process data to [Pulsewise](https://pulsewise.app).
+
+## Quick Install
+
+```bash
+curl -sSL https://pulsewise.app/install-collector.sh | TOKEN=your-token sudo -E bash
+```
+
+That's it. The script downloads the binary, writes the config, and starts a systemd service. Hostname is auto-detected.
+
+If you prefer an interactive install (prompts for token and hostname):
+
+```bash
+curl -sSL https://pulsewise.app/install-collector.sh | sudo bash
+```
+
+## What It Collects
+
+Every 30 seconds, the collector sends:
+
+| Category | Metrics |
+|----------|---------|
+| **System** | OS, platform, platform version, kernel version, architecture, virtualization type, CPU model |
+| **Uptime** | Seconds since boot |
+| **Load average** | 1m, 5m, 15m |
+| **CPU** | Overall %, per-core %, core count |
+| **Memory** | Total, available, used, usage % |
+| **Swap** | Total, used, free, usage % |
+| **Disks** | Per mount point: device, fstype, total, free, used, usage % |
+| **Disk I/O** | Read/write bytes, read/write count, IOPS in progress |
+| **Network** | Bytes and packets sent/received per second (rate, not cumulative) |
+| **Processes** | Top 10 by CPU: PID, name, command, CPU%, memory%, CPU time, RSS |
+
+See [`payload.json`](payload.json) for a full example of the JSON sent to the API.
+
+## Configuration
+
+Config lives at `/etc/pulsewise-collector/config`:
+
+```
+TOKEN=your-token-here
+```
+
+All other options are optional:
+
+| Key | Default | Description |
+|-----|---------|-------------|
+| `TOKEN` | *(required)* | Your Pulsewise API token |
+| `HOSTNAME` | System hostname | Override the reported hostname |
+| `URL` | `https://pulsewise.app/api/collect` | Override the API endpoint |
+| `DEBUG` | `false` | Log full response body from the server |
+
+Config file permissions should be `600` (root-only readable).
+
+For local development on macOS, the collector also checks `~/.config/pulsewise-collector/config`.
+
+## Development
+
+```bash
+# Create local config
+mkdir -p ~/.config/pulsewise-collector
+echo "TOKEN=test-token" > ~/.config/pulsewise-collector/config
+
+# Build and run
+./build.sh
+./pulsewise-collector
+```
+
+To point at a local server:
+
+```
+TOKEN=test-token
+URL=http://localhost:8000/api/collect
+DEBUG=true
+```
+
+## Cross-Compiling
+
+```bash
+GOOS=linux GOARCH=amd64 go build -o pulsewise-collector-linux-amd64
+GOOS=linux GOARCH=arm64 go build -o pulsewise-collector-linux-arm64
+```
+
+Or use `./deploy.sh` to compile both architectures and copy them into the Pulsewise Laravel app.
+
+## Managing the Service
+
+```bash
+sudo systemctl status pulsewise-collector
+sudo journalctl -u pulsewise-collector -f
+sudo systemctl restart pulsewise-collector
+sudo systemctl stop pulsewise-collector
+```
+
+## How It Works
+
+- Collects metrics every 30 seconds using [gopsutil](https://github.com/shirou/gopsutil)
+- Sends JSON via `POST` to the configured URL with `Authorization: Bearer <token>`
+- Network metrics are computed as per-second rates (delta between intervals); the first collection sends `null` for network
+- Runs as a systemd service with automatic restart on failure
+
+## License
+
+MIT