fix(cli): add execute permission to bin/codex.js

[zerone0x]

Summary

Fixes #9520

The bin/codex.js file was missing execute permissions (644 instead of 755), causing the codex command to fail after npm global installation.

Changes

• Added execute permission (+x) to codex-cli/bin/codex.js

Verification

After this fix, npm tarballs will include the correct file permissions:

# Before: -rw-r--r-- (644)
# After:  -rwxr-xr-x (755)

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🤖 Generated with Claude Code

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