chore: update launchdarkly-node-client-sdk to 3.4.0

[devin-ai-integration]

Summary

Bumps the launchdarkly-node-client-sdk dependency floor to track the latest release within the current major version.

- "launchdarkly-node-client-sdk": ">= 3.0.0"
+ "launchdarkly-node-client-sdk": ">= 3.4.0"

• Latest published version on npm is 3.4.0; the previous constraint >= 3.0.0 resolves to it, so this raises the minimum floor to 3.4.0 while preserving the >= pinning style. Stays within major v3 (no v4 exists).
• Deprecated APIs: none in use. The only deprecation in the SDK typings is LDUser; index.js already uses a single-kind context ({ kind: 'user', ... }), so no migration is needed.
• Testing: ran npm install (resolves launchdarkly-node-client-sdk@3.4.0) and CI=1 LAUNCHDARKLY_CLIENT_SIDE_ID=<client-side-id> node index.js. Output:

info: [LaunchDarkly] LaunchDarkly client initialized
*** SDK successfully initialized!
*** The 'sample-feature' feature flag evaluates to false.

• No README SDK-version or platform/tooling changes required (package-lock.json is gitignored, so no lockfile change).

Link to Devin session: https://app.devin.ai/sessions/a9ea4c17ef544ec1b20f9e1e90ae02d8

---

Note

Low Risk
Dependency constraint-only change in a hello-world sample with no logic changes.

Overview
Raises the minimum version of launchdarkly-node-client-sdk from >= 3.0.0 to >= 3.4.0 in package.json, so installs always pick up 3.4.0+ within major v3 instead of allowing older 3.x releases.

No application code changes; the sample still uses the same client-side SDK usage in index.js.

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