chore: bump version to 0.2.0

[rlippmann]

Summary

Bump context-compiler-example-integrations from 0.1.2 to 0.2.0 in preparation for the next PyPI release.

Why

The repository has accumulated material changes since the 0.1.2 release, including expanded and hardened reference integrations and adoption of the stable Context Compiler and Directive Drafter releases.

A new package version is required before publishing the updated repository to PyPI.

Example metadata

• Enforcement point: N/A
• Domain: package/release maintenance
• Technology/runtime: Python / PyPI
• Example type: repository maintenance
• Does this use directive drafter? should normally be no: N/A
• Does this derive state from model output? must be no for primary examples: No

Checklist

• Repository scaffolding / governance change
• One primary enforcement point
• Explicit authoritative state
• No model-derived state mutation
• Adversarial stub or equivalent test
• Observable runtime behavior change
• Domain vocabulary is natural
• Framework is secondary to the enforcement point
• Docs updated
• Tests/smoke checks added where practical

Notes

This PR only updates the package release version to 0.2.0. It does not change integration behavior or Context Compiler semantics.

The version bump prepares the repository for publication through the existing PyPI release workflow.