Fix Separation Agreement normal walkthrough

[drkwjr]

Summary

• Adds the missing trial_court: MACourt object for the current Separation Agreement entrypoint.
• Adds a direct trial_court.division question so the existing court field can be answered in the standalone flow.
• Adds explicit Party A and Party B address screens for the current entrypoint, avoiding the shared generic address question path that was producing the nota error.

Why

The current standalone walkthrough for docassemble.ADivorceAgreement:divorceagreement.yml was blocked after the opposing-party address screen with:

Problem getting current question:'nota'

The failure was reproducible on origin/main and was separate from the Portable/schema adapter work. Keeping this as a separate PR lets the schema adapter PR stay focused on nomenclature/schema alignment.

Closes #3.

Validation

• python3 YAML parse across all question YAML files
• Embedded Python code: block syntax check with ast.parse
• git diff --check
• Local Docker normal full walkthrough for docassemble.ADivorceAgreement:divorceagreement.yml:
  • completed successfully in 23 steps
  • reached terminal screen download a_divorce_agreement
  • downloaded a_divorce_agreement.pdf
  • PDF generation assertion passed

Note

The older docassemble.ADivorceAgreement:a_divorce_agreement.yml entrypoint still fails earlier on a separate children-flow issue in local testing. This PR is intentionally scoped to the current entrypoint and issue #3.