Load PTY adapter at runtime

[shivamhwp]

What Changed

Updated the server PTY adapter wiring in apps/server/src/serverLayers.ts to lazy-load the runtime-specific adapter instead of eagerly importing both BunPTY and NodePTY.

The server now:

• Detects the active runtime with process.versions.bun
• Loads ./terminal/Layers/BunPTY only for Bun on non-Windows platforms
• Loads ./terminal/Layers/NodePTY for Node and other fallback cases

Fixes

• Bug: bunx t3@alpha fails on Linux rebuilding node-pty #204
• Bug: bunx t3@alpha fails on Linux rebuilding node-pty ecatuogno1/t3code#23

Why

bunx t3 should use the Bun terminal API path, while npx t3 should use the Node PTY path. The previous implementation imported both adapters up front and only selected between them later, which made runtime-specific loading less explicit.

This change makes PTY adapter resolution match the actual runtime in use and keeps Bun-only code out of the Node path and Node-only code out of the Bun path. It also aligns the PTY loading pattern with the existing runtime-specific lazy loading already used in the SQLite layer.

UI Changes

Not applicable.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Load PTY adapter via dynamic import at runtime instead of static import

• Replaces the compile-time ternary between BunPtyAdapterLive and NodePtyAdapterLive with a makeRuntimePtyAdapterLayer function in serverLayers.ts that selects and loads the adapter at runtime.
• Selects the Bun adapter when process.versions.bun is defined and the platform is not win32, otherwise falls back to the Node adapter.
• Uses dynamic import() via Effect.promise so neither adapter module is bundled or evaluated unless it is needed.

^{Macroscope summarized d3ebbe6.}

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