What does this PR do?

Adds the missing mcp_serve module to the setuptools py-modules list in pyproject.toml, fixing hermes mcp serve crashing with ModuleNotFoundError: No module named 'mcp_serve' on standard pip installs.

Related Issue

Fixes #34871

Type of Change

• Bug fix (non-breaking change that fixes an issue)

Changes Made

• pyproject.toml: Added "mcp_serve" to the [tool.setuptools] py-modules list so the top-level module is included in built wheels

How to Test

1. Install hermes-agent via pip: pip install hermes-agent
2. Run hermes mcp serve
3. Verify it no longer crashes with ModuleNotFoundError: No module named 'mcp_serve'

Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits (fix(scope):, feat(scope):, etc.)
• I searched for existing PRs to make sure this isn't a duplicate
• My PR contains only changes related to this fix/feature (no unrelated commits)
• I've run pytest tests/test_mcp_serve.py tests/hermes_cli/test_mcp_config*.py -q and all tests pass (119 passed)
• I've added tests for my changes -- or N/A (packaging metadata change, existing tests cover the module)
• I've tested on my platform: macOS

Documentation & Housekeeping

• I've updated relevant documentation (README, docs/, docstrings) -- or N/A
• I've updated cli-config.yaml.example if I added/changed config keys -- or N/A
• I've updated CONTRIBUTING.md or AGENTS.md if I changed architecture or workflows -- or N/A
• I've considered cross-platform impact (Windows, macOS) per the compatibility guide -- or N/A
• I've updated tool descriptions/schemas if I changed tool behavior -- or N/A

Code Intelligence

• GitNexus unavailable -- grep-based fallback used.
• Checked: pyproject.toml (py-modules list), hermes_cli/mcp_config.py:794 (from mcp_serve import run_mcp_server), mcp_serve.py (root module, 897 lines)
• Blast radius: LOW -- single packaging metadata line, no code logic changes
• Related patterns: Other top-level modules (run_agent, model_tools, etc.) already in the list; mcp_serve was the only missing one

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