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

Part of a cross-repo effort to populate the features field in .sdk_metadata.json for all LaunchDarkly SDKs.

Describe the solution you've provided

Adds a features map to the react-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 are sourced from the SDK features documentation table (JavaScript-based client-side SDKs → React Web column) and verified against the repository's CHANGELOG.

15 features included (alphabetical): allFlags, appMetadata, bigSegments, bootstrapping, contexts, experimentation, flagChanges, hooks, perContextSummaryEvents, pluginSupport, privateAttrs, relayProxyProxy, secureMode, track, variationDetail.

Updates since last revision

Added two new features, verified against CHANGELOG.md:

• hooks: introduced in 3.7 — confirmed via CHANGELOG entry "Add hook and plugin support" under ## [3.7.0]. Note: this is the LaunchDarkly evaluation hooks feature, distinct from the React hooks (useState/useEffect) added in 2.11.0.
• perContextSummaryEvents: introduced in 3.8 — confirmed via CHANGELOG entry "Add support for per-context summary events" under ## [3.8.0].

Updated four feature versions per reviewer guidance that version 2.9 was the first actual react-client-sdk release (prior versions were part of js-client-sdk):

• bigSegments: 1.0 → 2.9
• experimentation: 1.0 → 2.9
• track: 1.0 → 2.9
• relayProxyProxy: 2.20.2 → 2.9 — the 2.20.2 entry was a relay proxy bug fix, not the feature's introduction; relay proxy support was available from the first react-client-sdk release.

Human review checklist

• Verify the 2.9 convention — seven features are listed at 2.9 (allFlags, bigSegments, experimentation, flagChanges, privateAttrs, relayProxyProxy, track). These represent features available from the first actual react-client-sdk release. Confirm this is the correct set and that none should have a different version.
• Verify pluginSupport: "3.7" — mapped from the "Observability plugin" row in the docs table. Introduced in the same release as hooks. Confirm this mapping is correct.
• Spot-check non-2.9 introduction versions against the repo's CHANGELOG or release history (e.g., bootstrapping: "2.9.5", secureMode: "2.18", appMetadata: "2.26", contexts: "3.0", variationDetail: "2.21").
• Confirm no supported features are missing — the docs table shows empty cells for migrations, offlineMode, autoEnvAttrs, fileDataSource, testDataSource, webProxy, and others. Verify these are truly unsupported by this SDK.

Describe alternatives you've considered

N/A — follows the established pattern from other SDKs (e.g., js-core, go-server-sdk).

Additional context

• Link to Devin session
• Requested by: Aaron Zeisler

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Note

Low Risk
Metadata-only change adding feature/version annotations for the React Web SDK; no runtime code or behavior is modified. Risk is limited to downstream tooling that consumes .sdk_metadata.json potentially relying on these values.

Overview
Adds a new features map under react-client-sdk in .sdk_metadata.json that enumerates supported SDK capabilities (e.g., contexts, hooks, secureMode) and records the version each was introduced.

No runtime code changes; this updates repository metadata used for documentation/tooling.

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[devin-ai-integration]

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[aaron-zeisler]

Devin: For relayProxyProxy, let's set the version to 2.9 for when that feature was introduced. I believe a bug related to relay proxy was fixed in 2.20.2, not the feature's introduction.

[devin-ai-integration]

Done — updated relayProxyProxy from 2.20.2 → 2.9. The 2.20.2 entry was a bug fix, not the feature introduction; relay proxy support was available from the first react-client-sdk release.