Fix: Enable custom group_id in add_episode MCP tool

[markalosey]

Problem:

The add_episode MCP tool failed when a custom group_id string was provided, erroring with Parameter 'group_id' must be of type undefined, got string. This prevented assigning episodes to specific, non-default groups.

Solution:

This branch corrects the handling of the group_id parameter in the add_episode tool, allowing custom string group_ids to be processed successfully.

Verification:

On this branch, after restarting the server:

1. Adding Episodes: Successfully added episodes with distinct custom group_ids (e.g., project_alpha_fix_test_001, project_beta_fix_test_002).
2. Searching Nodes:
   • Confirmed search_nodes correctly filters by a single specified group_id.
   • Confirmed search_nodes correctly filters by a list of specified group_ids.

This validates that adding to and searching within custom groups now works as intended.

Note on Search Behavior:

Currently, search_nodes without a specified group_id defaults to the server's main group_id rather than searching all groups. This could be a future enhancement if "search all" is desired for that scenario.

---

[!IMPORTANT] Fixes add_episode tool to correctly handle custom group_id strings and updates related functions for default handling.

• Behavior:
  • Fixes handling of group_id in add_episode to accept custom strings, defaulting to config.group_id if empty.
  • Updates search_nodes, search_facts, and get_episodes to handle empty group_id as default.
• Configuration:
  • GraphitiConfig.from_cli_and_env() now sets group_id with precedence: CLI > Env Var > Default.
  • Logs group_id source in initialize_server().
• Testing:
  • Makefile: Updates test target to load .env.test using python-dotenv.
  • pyproject.toml: Adds python-dotenv-run to dev dependencies.

^{This description was created by for 7aba34bca9e6f3428d4c7a0bf8e55713d5972ec3. You can customize this summary. It will automatically update as commits are pushed.}

[danielchalef]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[markalosey]

I have read the CLA Document and I hereby sign the CLA

[danielchalef]

@markalosey Thank you for this contribution! Just a heads up: I won't be able to review the PR for a few weeks. Expect an early June response. Apologies in advance for the delay!

[prasmussen15]

Thanks for the contribution, are you able to resolve the conflicts?

[markalosey]

I apologize for the delay. I'm just seeing this. I'll get to it this weekend