Detect command not found when checking codex/claude CLI on Windows

[Alexx999]

What Changed

Use isWindowsCommandNotFound to check if codex/claude CLI is missing.
Extracted spawnAndCollect method to avoid copypasting the check.

Why

On Windows, missing Codex CLI gives misleading message:
"Codex CLI is installed but failed to run. 'codex' is not recognized as an internal or external command, operable program or batch file."

Checklist

• This PR is small and focused
• I explained what changed and why

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Note

Low Risk
Low risk: refactors provider health-check command execution and improves Windows-only error detection for missing CLIs, which mainly affects status reporting and messaging.

Overview
Improves Windows handling for provider health checks by treating cmd.exe "command not recognized" failures as a missing CLI, so Codex/Claude report not installed/on PATH instead of a generic execution failure.

Extracts a shared spawnAndCollect helper in providerSnapshot.ts (used by CodexProvider and ClaudeProvider) and exports isWindowsCommandNotFound from processRunner.ts to centralize this detection.

^{Written by Cursor Bugbot for commit 0a2f12c. This will update automatically on new commits. Configure here.}

Note

Detect command-not-found errors for Codex and Claude CLI on Windows

• Adds a spawnAndCollect helper in providerSnapshot.ts that centralizes process spawning, stream collection, and Windows command-not-found detection.
• Both ClaudeProvider and CodexProvider now delegate to spawnAndCollect instead of handling spawn logic inline.
• Behavioral Change: when the CLI binary is missing on Windows, the effect now fails with an ENOENT-style error instead of returning a successful CommandResult with exit code 9009.

^{Macroscope summarized 0a2f12c.}

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[juliusmarminge]

thanks