fix: run fixPath() before provider health check layer construction

[JungHoonGhae]

Summary

On macOS, Electron apps inherit a minimal PATH that typically excludes directories like /opt/homebrew/bin. The Codex provider health check (ProviderHealthLive) runs during layer construction in LayerLive, which happens before the existing fixPath() call in makeServerProgram. This means the health check cannot locate the codex binary even when it is properly installed via Homebrew or npm global, causing:

Codex CLI (codex) is not installed or not on PATH.

This PR moves the fixPath() call to module-level in main.ts so it executes before any layer construction begins. The existing call inside makeServerProgram is kept as-is since fixPath() is idempotent.

Reproduction

1. Install Codex CLI via npm global (npm i -g @openai/codex)
2. Open T3 Code (Alpha) on macOS — the Electron app does not include /opt/homebrew/bin in its PATH
3. Observe "Codex CLI (codex) is not installed or not on PATH" error in provider status

Test plan

• bun lint passes (0 errors)
• bun run test passes (392 tests, 0 failures)
• Existing ProviderHealth.test.ts tests still pass

Note

Run apps/server bootstrap fixPath() before constructing provider health check layers in main.ts

Insert an early call to fixPath() during module bootstrap in main.ts before building layers and executing provider health checks.

📍Where to Start

Begin at the module bootstrap in main.ts, focusing on the early fixPath() invocation and the subsequent health check layer construction.

^{Macroscope summarized 15a383b.}

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[JungHoonGhae]

Closing in favor of #248 which addresses the same PATH resolution issue more comprehensively (shared shellPath resolver, ANSI stripping, fish support, desktop+server coverage).