12: config loaded correctly with comments stripped off

[semere-meb]

Summary

Reads config file, strips comment lines, and return Config object.

Closes #12

Changes

• simplified pydantic model (Config) to be more declarative
• parser cleans the config and hands off the json config to pydantic for validation
• returns a valid Config data.

Testing

• make lint passes locally
• make test passes locally (check N/A below if no tests exist yet for this area)
• Manually tested the behavior described above
• N/A — no automated tests apply to this change yet

Checklist

• PR title follows <TICKET-ID>: short description
• Linked to the correct issue (Fixes #... above)
• No unrelated changes bundled into this diff
• Updated docs/design/ if this changes config shape, architecture, or a game-design decision
• Updated README if this changes user-facing behavior (config keys, controls, etc.)