[codex] Modularize chat prompts and tests

[anth-volk]

Fixes #91

Summary

• Move UK chat runtime prompts into a dedicated backend/prompts.py module.
• Add factual-neutrality and row-level microdata rules to prompts and exposed tool metadata.
• Add PR CI for backend pytest and frontend production build.
• Clean up backend tests around live Anthropic calls, compiled-engine availability, conversation table isolation, and stale compute coverage.
• Add model-agnostic AI guidance docs under docs/engineering/skills/ with thin adapters for AGENTS, Claude, and Copilot.

Validation

• PYTHONPATH=backend python -m pytest backend/tests/test_prompts.py backend/tests/test_agent_tools.py
• npm run build in frontend/
• git diff --check --cached before commit

Notes

The full backend suite is intended to run in CI after installing backend/requirements.txt. Local compiled-engine-dependent tests skipped cleanly where policyengine_uk_compiled was not installed.

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Project	Deployment	Actions	Updated (UTC)
policyengine-uk-chat	Ready	Preview, Comment	May 29, 2026 5:10pm

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Beta preview is ready.

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