docs(windows): add native Windows guide + install one-liner on landing page (#22089)

New page: website/docs/user-guide/windows-native.md — comprehensive
Windows-native deep dive covering:

- Quick install (irm | iex) and parameterized form
- What the installer does end-to-end (uv, Python 3.11, Node 22,
  PortableGit, messaging SDK bootstrap)
- Feature matrix: native Windows vs WSL2 (dashboard /chat is WSL-only)
- How Hermes runs shell commands on Windows (Git Bash resolution,
  HERMES_GIT_BASH_PATH override, MinGit layout pitfall)
- UTF-8 console shim (configure_windows_stdio, opt-out via
  HERMES_DISABLE_WINDOWS_UTF8)
- Editor handling (notepad default, VSCode/Notepad++/nvim overrides,
  why Ctrl-X Ctrl-E used to silently do nothing)
- Ctrl+Enter for newline in the CLI
- Gateway as a Scheduled Task (schtasks + Startup-folder fallback,
  pythonw.exe detached spawn, why not a Windows Service)
- Data layout (%LOCALAPPDATA%\hermes vs %USERPROFILE%\.hermes split)
- PATH after install, environment variables, uninstall
- Process management internals (bpo-14484 os.kill(pid, 0) footgun,
  _pid_exists primitive, check-windows-footguns.py CI gate)
- 10+ concrete pitfalls with fixes

Also:
- docs/index.md: add inline 'Install' section with both Linux/macOS
  curl and Windows irm|iex one-liners right under the hero CTAs.
  Updates the quick-links row to include 'native Windows'.
- sidebars.ts: add Windows (Native) entry above Windows (WSL2).
- windows-wsl-quickstart.md: point native-install cross-link at the
  new dedicated page (was going to installation.md#windows-native).
- reference/environment-variables.md: document HERMES_GIT_BASH_PATH
  and HERMES_DISABLE_WINDOWS_UTF8 (previously undocumented).

website/docs/index.md

@@ -16,6 +16,24 @@ The self-improving AI agent built by [Nous Research](https://nousresearch.com).
   <a href="https://github.com/NousResearch/hermes-agent" style={{display: 'inline-block', padding: '0.6rem 1.2rem', border: '1px solid rgba(255,215,0,0.2)', borderRadius: '8px', textDecoration: 'none'}}>View on GitHub</a>
 </div>
 
+## Install
+
+**Linux / macOS / WSL2**
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/NousResearch/hermes-agent/main/scripts/install.sh | bash
+```
+
+**Windows (native, PowerShell)**
+
+```powershell
+irm https://raw.githubusercontent.com/NousResearch/hermes-agent/main/scripts/install.ps1 | iex
+```
+
+**Android (Termux)** — same curl one-liner as Linux; the installer auto-detects Termux.
+
+See the full **[Installation Guide](/docs/getting-started/installation)** for what the installer does, the per-user vs root layout, and Windows-specific notes.
+
 ## What is Hermes Agent?
 
 It's not a coding copilot tethered to an IDE or a chatbot wrapper around a single API. It's an **autonomous agent** that gets more capable the longer it runs. It lives wherever you put it — a $5 VPS, a GPU cluster, or serverless infrastructure (Daytona, Modal) that costs nearly nothing when idle. Talk to it from Telegram while it works on a cloud VM you never SSH into yourself. It's not tied to your laptop.
@@ -24,7 +42,7 @@ It's not a coding copilot tethered to an IDE or a chatbot wrapper around a singl
 
 | | |
 |---|---|
-| 🚀 **[Installation](/docs/getting-started/installation)** | Install in 60 seconds on Linux, macOS, or WSL2 |
+| 🚀 **[Installation](/docs/getting-started/installation)** | Install in 60 seconds on Linux, macOS, WSL2, or native Windows |
 | 📖 **[Quickstart Tutorial](/docs/getting-started/quickstart)** | Your first conversation and key features to try |
 | 🗺️ **[Learning Path](/docs/getting-started/learning-path)** | Find the right docs for your experience level |
 | ⚙️ **[Configuration](/docs/user-guide/configuration)** | Config file, providers, models, and options |