test: move tests into their packages and run them per package

[userAugustos]

Closes #126. Stacked on #130: the base of this PR is the #130 branch, so the diff shows only this change.

Summary

• Each package owns its tests. Five CLI tests move to packages/cli/tests. Twenty-six core tests move to packages/core/tests. The root tests/ keeps the end-to-end harness: run_tests.sh, README.md, test_integration.py, test_performance.py.
• Each package declares pytest in its own dev group. That is what makes Turborepo synthesize one test task per package. pytest leaves the root dev group, and the root task becomes an explicit command over tests/ only.
• bun run test runs the three tasks. bun run test --filter=canyonos or --filter=canyonos-core runs one package. A package task caches and only reruns when that package or its own dependency closure changes.
• One test changes content: the path line in test_otel_exporter_fanout.py that the move forced. run_tests.sh also runs the package suites.

Test

• uv sync from a clean checkout installs pytest and both packages.
• bun run test: canyonos 65 passed, canyonos-python 10 passed, canyonos-core 167 collected with the 11 known errors.
• bun run test --filter=canyonos runs only the CLI tests and hits the cache on a second run.
• bun run check passes.

Review Focus

• turbo.json: the root test task runs pytest tests with inputs: ["tests/**"], so a change under packages/ does not rerun it.
• The split of test files by import (canyonos vs canyonos_core).
• tests/run_tests.sh line that runs the unit suites before the live deployment.

Known and accepted

• canyonos-core#test is red with the 11 known collection errors, so bun run test still exits non-zero. Follow-up: test: make core tests collect outside the Docker image #127.
• Nine core tests keep a dead sys.path line that points at a grpc_stubs directory that no longer exists. It was dead before the move. Test cleanup is not in scope for this stack.
• CI runs no pytest. Follow-up: ci: run the root checks and tests through Turborepo #128.

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