chore: upgrade Python integrations to context-compiler dev13

[rlippmann]

Summary

Upgrade Python examples and reference integrations to:

• context-compiler==0.9.0dev13
• context-compiler-directive-drafter==0.2.0dev2

Why

Update the examples and integrations to the current Context Compiler API contract.

This keeps the reference integrations aligned with authoritative core behavior:

• decision handling uses the dev13 decision-object API;
• replacement directives follow core semantic requirements;
• semantic errors and repairs are surfaced rather than bypassed.

Example metadata

• Enforcement point: existing enforcement points (reference integrations and examples)
• Domain: multiple example domains
• Technology/runtime: Python examples and reference integrations
• Example type: repository maintenance
• Does this use directive drafter? should normally be no: No new usage added; existing drafter integrations updated where applicable
• 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

No core changes or compatibility shims were added.

Validation:

• ./scripts/validate_python.sh
• 148 tests passed
• 100% coverage (349 statements)
• pre-commit hooks passed