feat: add Windows hook support for rtk init --global

[daixudk96-max]

Summary

• Removes Unix-only #[cfg(unix)] guards from src/init.rs, enabling hook-based mode on Windows
• Adds hooks/rtk-rewrite.js: a Node.js PreToolUse hook that calls rtk rewrite via execFileSync, with fail-open behavior (silently passes through on error)
• Platform-aware helpers: hook_filename(), hook_content(), build_hook_command() select .sh on Unix and .js on Windows
• Windows hook command format: node "C:\Users\...\.claude\hooks\rtk-rewrite.js" (object-style {"type":"command","command":"..."})
• Adds 3 Windows-specific tests: test_windows_hook_uses_rtk_rewrite, test_insert_hook_entry_windows_command, test_hook_already_present_windows_command

Motivation

Currently rtk init --global falls back to --claude-md mode on Windows, which injects ~137 lines into CLAUDE.md and relies on the LLM to "remember" to prefix commands with rtk. This is unreliable and wastes tokens. With this PR, Windows users get the same transparent hook-based interception that Unix users enjoy.

Test plan

• cargo test init::tests passes (all existing + new Windows tests)
• cargo check clean (no new warnings from this PR)
• On Windows: rtk init --global --auto-patch installs rtk-rewrite.js to ~/.claude/hooks/ and patches settings.json
• On Unix: behavior unchanged (still uses rtk-rewrite.sh)

Known issue

On Windows with default stack size, cargo run may hit STATUS_STACK_OVERFLOW due to large embedded string constants. Adding .cargo/config.toml with rustflags = ["-C", "link-arg=/STACK:8388608"] resolves this. Not included in this PR as it may be environment-specific.

[pszymkowiak]

Hi! Thanks for the contribution! Since March 6, all PRs should target the develop branch instead of master (see CONTRIBUTING.md).

Could you update the base branch? Click Edit at the top right of this PR and change it from master to develop.

Thanks!

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

CI User seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[pszymkowiak]

Thanks for the contribution! This feature has already been integrated in the latest version (v0.33.1). Please verify with the latest release that everything works as expected on your side.

Closing as already included — thanks!

[aeppling]

Hey

We are cleaning up the codebase and improving the project structure for better onboarding. As part of this effort, PR #826 reorganizes src/ from a flat layout into subfolders.

No logic changes — only file moves and import path updates.

What you need to do

Rebase your branch on develop when receiving this comment:

git fetch origin && git rebase origin/develop

Git detects renames automatically. If you get import conflicts, update the paths:

use crate::git;        // now: use crate::cmds::git::git;
use crate::tracking;   // now: use crate::core::tracking;
use crate::config;     // now: use crate::core::config;
use crate::init;       // now: use crate::hooks::init;
use crate::gain;       // now: use crate::analytics::gain;

Need help rebasing? Tag @aeppling