fix: implement shadow copying for native binaries on Windows

[mynameistito]

Summary

This PR implements Shadow Copying for the bun-pty native binaries on Windows to resolve file-locking conflicts that cause the OpenCode Host to crash during multi-instance startup.

Changes

• Created src/plugin/pty/shadow.ts to handle copying the rust_pty.dll to a temporary directory and setting process.env.BUN_PTY_LIB.
• Refactored PTYManager in src/plugin/pty/manager.ts to lazy-load the bun-pty module only when needed, after ensuring the shadow copy is prepared.
• Updated ptySpawn tool in src/plugin/pty/tools/spawn.ts to support the now-async manager.spawn method.

Impact

• Fixes [Windows] Startup crash when opening multiple instances: EBUSY: failed copying files... package bun-pty #7: Prevents EBUSY errors when OpenCode attempts to verify plugins (especially those on @latest) while a PTY session is active.
• Improved Multi-instance Stability: Multiple instances of OpenCode can now start and verify their integrity without hitting locks on the PTY driver.

[mynameistito]

Please don't merge yet 😅

Edit: sweet it works as intended on Windows!

However maybe a little laggy if anyone else on Windows wants to check it out too that would be great :)

[shekohex]

You should upgrade to https://github.com/shekohex/opencode-pty/releases/tag/v0.1.5 and try to apply your fix. or maybe it works without it? opencode uses the same lib internally, so maybe worth firing off an agent and it will help with that.

Needs more eyes on this PR for people with windows machines to try it out.

[mynameistito]

You should upgrade to v0.1.5 (release) and try to apply your fix. or maybe it works without it? opencode uses the same lib internally, so maybe worth firing off an agent and it will help with that.

Needs more eyes on this PR for people with windows machines to try it out.

Will have a suss, also FYI that was fired off by my agent 😭

[mynameistito]

You should upgrade to v0.1.5 (release) and try to apply your fix. or maybe it works without it? opencode uses the same lib internally, so maybe worth firing off an agent and it will help with that.
Needs more eyes on this PR for people with windows machines to try it out.

Will have a suss, also FYI that was fired off by my agent 😭

Hey so yeah, I haven't fired my agent on it yet, but it still insta crashes with it on. and giving the issue failed to install for a plugin that is set after this plugin.

Will try get my agent to fix it later.