feat(windows): native Copilot Chat hook support without WSL

[yc-mattborja]

Summary

Enables full RTK hook support for VS Code Copilot Chat on native Windows — no WSL, bash, or Unix tools required.

The PreToolUse hook mechanism (rtk hook copilot) is a native Rust binary communicating via JSON stdin/stdout. It works identically on Windows, Linux, and macOS. This PR documents the Windows-native path, fixes the broken hook config, and provides automated setup tooling.

Changes

File	Change
.github/hooks/rtk-rewrite.json	Bug fix: "rtk hook" → "rtk hook copilot" — bare rtk hook exits code 1 with usage error
docs/WINDOWS-NATIVE.md	Architecture diagram, manual setup, supported commands table, troubleshooting
scripts/windows-copilot-setup.ps1	Automated setup: binary install, ripgrep, ls shim, hook config, verification. Fetches latest release dynamically via GitHub API (or accepts -Version pin)
docs/guide/getting-started/installation.md	Replace blanket "use WSL" with specific guidance per hook type

Motivation

The installation docs say "For full hook support, use WSL instead" — but this only applies to the Claude Code bash shell hook. The VS Code Copilot Chat hook is a completely different mechanism that already works natively. This PR:

1. Fixes the broken project-scoped hook config (missing copilot subcommand)
2. Documents the Windows-native path
3. Provides a setup script for the few Windows-specific gaps (ls binary, rg)
4. Corrects misleading "WSL required" language

Testing

Verified on Windows 11 x64 (no WSL, no Rust toolchain):

19/19 commands intercepted and rewritten — 100% catch rate
4/4 rewritten commands execute successfully on native Windows

# Reproduce
$json = '{"tool_name":"runTerminalCommand","tool_input":{"command":"git status"}}'
$json | rtk hook copilot
# → {"hookSpecificOutput":{"hookEventName":"PreToolUse","permissionDecision":"ask",
#    "updatedInput":{"command":"rtk git status"}}}

Additional notes:

• Linux/macOS/WSL: Zero changes to existing workflows
• Claude Code: Shell hook still documented as requiring bash/WSL
• Setup script: Opt-in, no side effects on non-Windows
• Hook fix: Makes existing .github/hooks/rtk-rewrite.json functional (was silently broken)
• No Rust code changes: CI gates (fmt, clippy, test, test-presence) unaffected

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