docs: add integration guide for upstream maintainer

INTEGRATION_GUIDE.md

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+# Integration Guide for upstream maintainer
+
+This document is intended for **allanmeng**, maintainer of
+[ComfyUI-XPUSYS-Monitor](https://github.com/allanmeng/ComfyUI-XPUSYS-Monitor).
+
+The changes below are scoped to making `AMDProvider` work on Windows without
+`rocm_smi_lib`. Nothing outside `providers/amd.py` and `providers/__init__.py`
+needs to change in your codebase. The `_utils.py` and `_TypeperfGpuQuery` are
+new standalone files you can take or leave.
+
+---
+
+## 1. Detection fix — `providers/__init__.py`
+
+**Location:** `_is_amd_rocme()` function
+
+**Problem:** `torch.version.roc` does not exist as an attribute on some
+Windows ROCm builds (tested with PyTorch 2.9.1+rocm7.2.1). Bare attribute
+access raises `AttributeError`, caught by the outer `except`, and the
+detector falls through to `NvidiaProvider`.
+
+**Fix (3 lines changed):** Replace `torch.version.roc` with
+`getattr(torch.version, 'roc', None)`. Add `getattr(torch.version, 'hip',
+None)` as a secondary signal. GPU name fallback (`"amd"`, `"radeon"`,
+`"advanced micro devices"`) for builds where neither `roc` nor `hip`
+attribute exists.
+
+```
+if getattr(torch.version, 'roc', None) is not None:
+    return True
+```
+
+---
+
+## 2. VRAM — `providers/amd.py` → `_read_vram()`
+
+**Replaces:** `rocm_smi.getMemFreeVdev(0)`, `.getMemSizeVdev(0)`,
+`.getMemUsedVdev(0)`
+
+**Substitute:** `torch.cuda.mem_get_info(device_index)` returns `(free_bytes,
+total_bytes)`. This is the same function used by NVIDIA CUDA — ROCm's HIP
+runtime implements the same API surface. Works on ROCm 6+ for Windows.
+
+```python
+free_bytes, total_bytes = torch.cuda.mem_get_info(0)
+free_gb = free_bytes / (1024**3)
+total_gb = total_bytes / (1024**3)
+used_gb = max(0.0, total_gb - free_gb)
+```
+
+**Caveat:** Call `torch.cuda.synchronize(0)` before `mem_get_info()` on
+initialisation — some ROCm builds defer HIP context creation until the first
+GPU operation and `mem_get_info` returns `(0, 0)` without an active context.
+
+---
+
+## 3. GPU load — `providers/amd.py` → `_read_gpu_load()`
+
+**Replaces:** `rocm_smi.getGpuBusyVdev(0)`
+
+**No direct torch equivalent.** Two options:
+
+### Option A (recommended): `typeperf` (Windows built-in)
+
+Add the `_TypeperfGpuQuery` class from `providers/_utils.py` in our repo.
+It calls:
+
+```
+typeperf "\GPU Engine(*)\Utilization Percentage" -sc 1
+```
+
+Parses the CSV output (one column per engine instance), takes `max()` across
+all engines. Available on every Windows system since Vista — zero
+dependencies. The `_utils.py` module is self-contained.
+
+### Option B: `amdsmi` (official AMD SMI library)
+
+`pip install amdsmi`. Talks directly to the AMD driver (not through WDDM).
+Currently Linux-only — the PyPI wrapper searches for `libamd_smi.so`. If AMD
+releases a Windows wheel in the future, this will work without code changes.
+The `_AmdSmiGpuQuery` class is in `providers/_utils.py`.
+
+---
+
+## 4. GPU frequency / temperature / power — `providers/amd.py`
+
+**Replaces:** `rocm_smi.getSingleClockSpeed(0)`, `.getTempVdev(0)`,
+`.getPowerVdev(0)`, `.getPowerCapVdev(0)`
+
+**No substitute available.** The AMD Windows WDDM driver on tested hardware
+(RX 9070 XT, ROCm 7.2) does not expose these through any Python-accessible
+API. Return sentinel values matching the `GPUSnapshot` contract defaults:
+
+| Metric | Sentinel | Effect |
+|---|---|---|
+| Core clock | `0.0` | Capsule shows `0MHz` |
+| Temperature | `-1.0` | Frontend greys out display |
+| Power draw | `(-1.0, 0.0, False)` | `power_available=False` greys out PWR capsule |
+
+---
+
+## 5. Shared utility functions — `providers/_utils.py` (optional)
+
+The CPU/RAM utility functions (`_get_cpu_info`, `_read_cpu_ram_stats`,
+`_read_commit_charge`, `_is_admin`) were extracted from `providers/intel.py`
+into a shared module. If you prefer to keep them in `intel.py`, just update
+the import in `amd.py` (and `nvidia.py`) accordingly:
+
+```python
+# For _utils.py:
+from ._utils import _get_cpu_info, _read_cpu_ram_stats, ...
+
+# For intel.py (original):
+from .intel import _get_cpu_info, _read_cpu_ram_stats, ...
+```
+
+---
+
+## Files to touch (minimal set)
+
+| File | Action |
+|---|---|
+| `providers/__init__.py` | Fix `_is_amd_rocme()` — 3 lines |
+| `providers/amd.py` | Replace `_read_vram`, `_read_gpu_load`, freq/temp/power sentinels, add `_TypeperfGpuQuery` import |
+| `providers/_utils.py` | **New file** — contains `_TypeperfGpuQuery` and optionally shared CPU/RAM utils |
+
+Everything else (`base.py`, `nvidia.py`, `xpu_server.py`, `web/`, `__init__.py`)
+is unchanged functionally from the upstream baseline.