Add missing mcp-client.mjs to services directory

[yourfriendfitz]

Summary

• Adds the missing mcp-client.mjs module to services/, which is imported by tools.mjs and claude-sessions.mjs
• Without this file, the gateway crashes on startup: Cannot find module './mcp-client.mjs'

Additional context

This is part of the fix for #3. The gateway crash was caused by two issues:

1. This repo: services/mcp-client.mjs was never committed (fixed by this PR)
2. homebrew-tap repo: The Homebrew formula flattens the apps/cli/ directory structure into libexec/, breaking relative imports that reference ../../../../shared/ or ../apps/cli/lib/. The formula at engindearing-projects/homebrew-tap needs a separate fix to either:
   • Preserve the apps/cli/ directory prefix in libexec/
   • Or rewrite imports during packaging

Homebrew formula fix needed (separate PR to homebrew-tap)

The current formula does:

libexec.install "apps/cli/bin", "apps/cli/commands", "apps/cli/lib",
                "apps/cli/src", "apps/cli/tui", "apps/cli/package.json"

This should instead preserve the monorepo path:

(libexec/"apps/cli").install Dir["apps/cli/*"]

And update the wrapper script to point at the correct entry:

(bin/"familiar").write <<~SH
  #!/bin/bash
  export FAMILIAR_PROJECT_DIR="#{libexec}"
  exec bun "#{libexec}/apps/cli/bin/familiar.mjs" "$@"
SH

Test plan

• Run familiar doctor — gateway should start without module errors
• Run familiar status — all services healthy
• Run familiar — TUI launches

Closes #3

🤖 Generated with Claude Code