The scan terminal service had accumulated cache, payload, filtering, AI prompt, AI merge, METAR gate, ranking, and city-row construction details in one file. This splits those stable responsibilities into focused modules while preserving the endpoint payload shape and existing behavior.
Constraint: User-visible behavior and release version must remain unchanged for this internal refactor
Rejected: Rewrite the terminal scan flow around a new abstraction | too risky while production behavior is being stabilized
Confidence: high
Scope-risk: moderate
Directive: Keep scan_terminal_service.py as orchestration; add detailed rule changes to the focused modules instead of re-growing the service file
Tested: py_compile for extracted modules; ruff check .; pytest tests/test_scan_terminal_modules.py tests/test_web_observability.py; full pytest; npm run test:business; npm run build; git diff --cached --check
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