expand and improve instrument documentation

[joshunrau]

Summary by CodeRabbit

• New Features

  • Added defineSeriesInstrument to the public runtime API.

• Documentation

  • Enhanced documentation on instruments and runtime concepts with improved code examples and terminology clarifications.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Documentation update to the instruments concept page introducing a top-level Overview section, restructuring content layout, correcting terminology ("tree-shaken"), clarifying runtime and bundling details, and documenting the newly added defineSeriesInstrument public API alongside defineInstrument.

Changes

Cohort / File(s)	Summary
Documentation Updates docs/en/4-concepts/4.1-instruments.mdx	Content restructuring with new Overview section, terminology corrections ("tree shaken" → "tree-shaken"), API documentation introducing defineSeriesInstrument, clarified runtime/bundling mechanics, and refined code samples reflecting updated API usage.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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