docs: add comment explaining _versionId leading underscore

[moss-bryophyta]

Adds a clarifying comment on the _versionId key in _KEY_MAP to explain the leading underscore is intentional and matches the gt.config.json convention for internal fields.

Addresses code review feedback.

Greptile Summary

This PR adds a single clarifying comment to the _versionId entry in _KEY_MAP inside _load_gt_config.py, explaining that the leading underscore is intentional and reflects the gt.config.json convention for marking internal fields. No functional code is changed.

• Adds # leading underscore intentional — matches gt.config.json convention for internal fields comment to line 19.
• No logic, types, or runtime behaviour are affected.

Confidence Score: 5/5

• This PR is safe to merge — it is a documentation-only change with no impact on runtime behaviour.
• The entire change is a single inline comment. No logic, control flow, types, or data transformations are modified, so there is zero risk of introducing a bug or regression.
• No files require special attention.

Important Files Changed

Filename	Overview
packages/gt-i18n/src/gt_i18n/internal/_load_gt_config.py	Adds an inline comment to the _versionId key in _KEY_MAP clarifying that the leading underscore is intentional and mirrors the gt.config.json convention for internal fields. No logic changes.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["load_gt_config(config_path)"] --> B{config_path provided?}
    B -- No --> C[Try default gt.config.json]
    B -- Yes --> D[Open explicit path]
    C -- Not found --> E[Return empty GTConfig]
    C -- Found --> F[Read & parse JSON]
    D -- Not found --> G[Raise FileNotFoundError]
    D -- Found --> F
    F -- Invalid JSON --> H[Raise ValueError]
    F -- Valid object --> I["Iterate _KEY_MAP\n(camelCase → snake_case)"]
    I --> J["Map _versionId → version_id\n(leading _ is intentional\nfor internal fields)"]
    I --> K[Map other keys]
    J --> L[Return GTConfig]
    K --> L

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