chore: move test_results into test/ and lint handlers (#24)

* ci: add reproducible test runner, fix requirements pins, use venv in workflow

* chore(ci): add Makefile, README test docs, run ruff in CI; remove .venv_ci

* docs: fix README markdown warnings; ci: add codecov token and pip cache for provider jobs

* ci: exclude duplicate router from mypy checks (known conflict)

* chore: remove duplicate src/llm/router.py to avoid mypy duplicate-module

* chore: move test_results into test/ directory

* Potential fix for code scanning alert no. 728: Workflow does not contain permissions

yes

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Author: 3 people

.github/workflows/python-test.yml

@@ -1,5 +1,8 @@
 name: Python Tests (consolidated)
 
+permissions:
+  contents: read
+
 on:
   push:
     branches: [ main ]