feat: warn about conflicting automations

[emi-ran]

Summary

• add pure explainable conflict analysis for opposing device-state actions
• warn before save or enable with deliberate override and conflict inspection
• align trigger overlap with runtime wildcard and matching semantics
• preserve Create/Edit/Home state while inspecting conflicts
• keep warning evidence free of sensitive trigger/action data

Verification

• python3 scripts/test_issue8_conflict_contracts.py
• python3 scripts/test_issue8_quality_contracts.py
• python3 scripts/test_lint_resource_contracts.py
• git diff --check origin/main...HEAD
• independent spec/security/quality review: approved

Known baseline

• scripts/check_backup_disclosure.py also fails on origin/main because existing English disclosure lacks unencrypted; unrelated to this PR.

Not run locally

• Gradle, Android build, APK and device tests; GitHub CI will run build/test checks.

Closes #8