chore: Standardize engine metadata

[Copilot]

Aligns Python client with other Flagsmith clients by renaming the metadata field used in client-engine communication from flagsmith_id to id. This change only affects internal metadata structures passed between client and engine—no impact on external APIs or evaluation logic.

Changes

Type definitions (flagsmith/types.py)

• SegmentMetadata.flagsmith_id → SegmentMetadata.id
• FeatureMetadata.flagsmith_id → FeatureMetadata.id

Mappers (flagsmith/mappers.py)

• Updated all metadata dictionary keys from "flagsmith_id" to "id"
• Renamed local variable flagsmith_id to feature_id in identity overrides mapping

Models (flagsmith/models.py)

• Updated metadata access pattern in Flag.from_evaluation_result()

Tests

• Updated test fixtures to use new field name

Example

# Before
flag_result: SDKFlagResult = {
    "enabled": True,
    "name": "feature",
    "metadata": {"flagsmith_id": 123}
}

# After
flag_result: SDKFlagResult = {
    "enabled": True,
    "name": "feature",
    "metadata": {"id": 123}
}

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• test_urlanalytics
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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Standardize engine metadata</issue_title>
<issue_description>For context, please visit this pull request: Flagsmith/flagsmith-php-client#117

The goal of this issue is to update the metadata field name from flagsmith_id to just id, wherever it occurs.

This only affects the communication between the client and the engine, and has no influence on the evaluation product, so there is no urgency in this — only sheer motivation to make our implementation consistent across code bases, and the team aligned.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Standardize engine metadata #176

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[khvn26]

LGTM

[emyller]

Nice job bot