Design Puzzle Loader Module (Level Configuration)

[Mkalbani]

Description

Build a loader module responsible for reading puzzle definitions from config files or embedded data.

Acceptance Criteria

• A loader module exists under src/loader/mod.rs
• Puzzles can be loaded from a JSON or TOML file
• Invalid or malformed puzzle files return descriptive errors
• Loaded puzzles are validated before being passed to the engine
• Unit tests cover valid load, invalid format, and missing file scenarios

[samuelfrancis163-eng]

please assign this issue to me. i am confident that i can work on this issue

[grantfox-oss]

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Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #6)
2. Your PR will be reviewed by the MindFlowInteractive maintainers

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