test: compile the controller protos for the core test session

[userAugustos]

Closes #127. Stacked on #133: the base of this PR is the #133 branch, so the diff shows only this change.

Summary

• The core runtime bare-imports the generated gRPC stubs, and only the container images provide them. A conftest.py in packages/core/tests now compiles every proto under canyonos_core/controller/proto into packages/core/build/pb at session start and puts that directory on sys.path. The directory is ignored by the root build/ rule.
• There was one root cause, not two. The gpu_metrics errors came from the except ImportError branch in local_controller.py, which runs when the frontend import fails on the missing stubs. With the stubs present, that branch never runs.
• The exporter test drops its fake stub modules and the now unused types import. The real stubs make them redundant.
• No runtime change. No new dependency: grpcio-tools is already a runtime dependency of canyonos-core.

Test

• bun run test: canyonos-core 226 passed, canyonos 65 passed, canyonos-python 10 passed. Second run hits the cache for all three.
• pytest from packages/core without turbo also passes.
• bun run check passes.

Review Focus

• packages/core/tests/conftest.py: the protoc invocation mirrors cli.py and the Dockerfile (python -m grpc_tools.protoc, all protos in the directory).
• The stubs are regenerated every session (about 50 ms) instead of cached, so there is no staleness check to get wrong.

Known and accepted

• Nine core tests keep a dead sys.path line pointing at a grpc_stubs directory that never existed in this layout. Dead before this PR, harmless, not test cleanup for this stack.
• CI still runs no pytest. Follow-up: ci: run the root checks and tests through Turborepo #128.

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