[m-messer]

Moves off baseevalutionfunctionlayer:main-3.8 (Python 3.8 runtime, deprecated; the base layer has stopped building the 3.8 image).

• app/Dockerfile: main-3.12, the same recipe as survey (dnf findutils, PYTHONPATH=/app, pytest, CMD ["app.handler"])
• Renamed evaluation_test.py to evaluation_tests.py. The base layer healthcheck imports evaluation_tests, which is why prod healthcheck currently reports tests_passed: false
• Workflows now match survey's: Python 3.12, deploy.yml@main instead of @deploy-request (main already contains everything from deploy-request), test-lint runs on PRs, and run-database-tests: true on production deploy
• Staging deploy now triggers on master (the repo's default branch). It used to trigger on main, so merges never reached staging. The production branch input now defaults to master
• Added pytest.ini and updated the README Python version

Testing (branch deployed to staging; not tested locally):

• PR CI on 3.12: passed
• Staging endpoint vs prod: healthcheck tests_passed went from false to true; eval output identical to prod
• Database tests on staging: 498/500, against a 100% threshold. Both failures are historical records where the response equals the answer ("30"/"30", "1"/"1" with type: str, sent by the harness as integers) but the stored grade is False. The function code is unchanged from prod (only the Dockerfile and test file name changed), so these aren't regressions. Excluding those IDs only surfaced more records of the same kind (2 more on rerun), so they're left as-is
• TEST_API_ENDPOINT repo secret set to the isExactEqual-staging URL so pre_production_tests.yml works

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