chore: scaffolding node-client-sdk migration

[joker23]

Requirements

• I have added test coverage for new or changed functionality
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions

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Additional context

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Note

Low Risk
Low risk because this is primarily monorepo/package scaffolding and release configuration with no functional runtime behavior beyond a placeholder version export.

Overview
Adds a new experimental @launchdarkly/node-client-sdk workspace with initial package scaffolding (README/LICENSE/CHANGELOG) and build/lint/test tooling (tsup, TypeScript configs, Jest, ESLint).

Wires the package into the monorepo and release automation by updating root workspaces, TS project references, release-please config/manifest, and ignores .claude/stacks/.

Includes only a placeholder src/index.ts exporting version to support building and version stamping.

^{Reviewed by Cursor Bugbot for commit 9193aa8. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

@launchdarkly/js-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 25623 bytes
Compressed size limit: 29000
Uncompressed size: 125843 bytes

[github-actions]

@launchdarkly/browser size report
This is the brotli compressed size of the ESM build.
Compressed size: 179311 bytes
Compressed size limit: 200000
Uncompressed size: 830815 bytes

[github-actions]

@launchdarkly/js-client-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 38473 bytes
Compressed size limit: 39000
Uncompressed size: 211104 bytes

[github-actions]

@launchdarkly/js-client-sdk size report
This is the brotli compressed size of the ESM build.
Compressed size: 31866 bytes
Compressed size limit: 34000
Uncompressed size: 113634 bytes

[joker23]

@cursor review

[joker23]

@cursor review

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

^{Reviewed by Cursor Bugbot for commit 9193aa8. Configure here.}

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.