fix: disable JIT by default for npx mcp run

[louis-jan]

Describe Your Changes

There’s an issue with running MCP on Mac that limits memory allocation to 128 bytes, which is broken. Since MCP runs using npx (with the built-in bun), it shouldn’t run with JIT, so no issues are introduced.

Fixes Issues

Failed to start MCP server Jan Browser MCP: Resolving dependencies
Resolved, downloaded and extracted [2]
Saved lockfile
Ran out of executable memory while allocating 128 bytes.

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed

[github-actions]

Barecheck - Code coverage report

Total: 30.18%

Your code coverage diff: 0.00% ▴

✅ All code changes are covered

[Jarred-Sumner]

There's ~no way this is correct. Is the binary codesigned properly? That's the more likely issue.

[Copilot]

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[louis-jan]

There's ~no way this is correct. Is the binary codesigned properly? That's the more likely issue.

Yeah, that’s weird. Initially, I've thought about codesigning, but haven’t found the clue yet. Do you have any ideas about why disabling JIT works?

UPDATE:
Found this: https://developer.apple.com/documentation/bundleresources/entitlements/com.apple.security.cs.allow-jit

[louis-jan]

Closed, this PR provides the proper fix for the same issue