chore: Update sdk_metadata features

[devin-ai-integration]

Requirements

• I have added test coverage for new or changed functionality — N/A, metadata-only change
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions — N/A, metadata-only change

Related issues

N/A — this is part of a cross-repo effort to populate the features field in each SDK's .sdk_metadata.json.

Describe the solution you've provided

Adds a features map to the flutter-client-sdk entry in .sdk_metadata.json, documenting which SDK features are supported and the version each was introduced. Feature keys use the canonical camelCase names from sdk-meta/products/feature_info.json, and introduction versions were sourced from the SDK features documentation table (the "all other client-side SDKs" → Flutter column) and verified against the repository's CHANGELOG.

Features included (16 total, alphabetical): allFlags, appMetadata, autoEnvAttrs, bigSegments, contexts, experimentation, flagChanges, hooks, inlineContextCustomEvents, offlineMode, perContextSummaryEvents, pluginSupport, privateAttrs, relayProxyProxy, track, variationDetail.

Updates since last revision

1. Added three features that were missing from the initial commit, verified against packages/flutter_client_sdk/CHANGELOG.md:

   • hooks: introduced in 4.12 — confirmed via CHANGELOG entry "Add support for hooks" under ## [4.12.0]
   • perContextSummaryEvents: introduced in 4.15 — confirmed via CHANGELOG entry "Add support for per-context summary events" under ## [4.15.0]
   • pluginSupport: introduced in 4.12 — confirmed via CHANGELOG entry "Add experimental plugin support" under ## [4.12.0]

2. Updated two feature versions per reviewer feedback (pre-1.0 versions were beta, so 1.0 is the correct first officially-supported version):

   • bigSegments: 0.1.0 → 1.0
   • experimentation: 0.2.0 → 1.0

Human review checklist

• Confirm no supported features are missing. The docs table was the primary source; CHANGELOG was used to verify specific features.
• Verify hooks: "4.12" and pluginSupport: "4.12" — both were introduced in the same release. Confirm these are the correct feature keys (hooks maps from "Hooks", pluginSupport maps from "Observability plugin" in the docs table).
• Verify perContextSummaryEvents: "4.15" — confirm this is the correct canonical feature key for per-context summary events.
• Spot-check other introduction versions against CHANGELOG (e.g. appMetadata: "1.3", autoEnvAttrs: "3.0", contexts: "2.0", inlineContextCustomEvents: "4.11.1")

Describe alternatives you've considered

N/A

Additional context

• Link to Devin session
• Requested by: Aaron Zeisler

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Note

Low Risk
Low risk metadata-only change that documents supported Flutter SDK features and their introduction versions; no runtime or API behavior is modified.

Overview
Adds a features map to the flutter-client-sdk entry in .sdk_metadata.json, listing supported capability keys and the SDK version each was introduced.

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[devin-ai-integration]

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[aaron-zeisler]

Devin: Let's use version 1.0 for both the bigSegments feature and the experimentation feature. Version 1.0 was the first officially-supported version, while pre-1.0 versions were beta versions.

[devin-ai-integration]

Done — updated both bigSegments from 0.1.0 → 1.0 and experimentation from 0.2.0 → 1.0, since pre-1.0 versions were beta.