[FEATURE] Add hex.pm to allowed network domains for Elixir/Phoenix development

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When using Claude Code remote sessions to work on Elixir/Phoenix projects, mix deps.get fails with a 403 Forbidden error because hex.pm (Elixir's package manager) is not in the allowed network domains.

This prevents:

• Installing dependencies via Mix
• Running tests that require dependencies
• Any meaningful development work on Elixir/Phoenix codebases

Proposed Solution

Add the following domains to the network allowlist:

• hex.pm
• repo.hex.pm

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

Configuration and settings

Use Case Example

_No response_

Additional Context

_No response_