fix(examples): separate Minikube host and agent gateway URLs

[Bluu (Bluuok)]

The Calc-X Minikube launcher starts its controller on the host, but passes host.minikube.internal as the controller's gateway URL and leaves the pod-specific agent_url unset. This conflates the two network locations.

Use localhost for the host controller and set agl_server.agent_url to host.minikube.internal for agent pods, matching the documented controller configuration. Add an isolated test that executes the actual launcher, captures its overrides, composes the real configuration and builds a real Job manifest to verify both pod URLs.

Validation in the frozen Linux CPU environment:

python -m pytest tests/examples/test_calc_x_minikube.py -q -p no:cacheprovider
python -m ruff check tests/examples/test_calc_x_minikube.py
python -m ruff format --check tests/examples/test_calc_x_minikube.py
python -m pre_commit run --files examples/calc_x/run_minikube.sh tests/examples/test_calc_x_minikube.py
git diff --check

The regression failed on unchanged main and passed with the fix. Scoped Pyright passed with 0 errors; launcher content normalized to repository LF line endings passed bash -n. The test also verifies the key, runner type, TTL and arguments containing spaces, with synchronization for the background controller stub.

All Minikube, Ray, HTTP, service, cleanup and training commands are isolated mocks. No real cluster, network or GPU training was exercised. Ready for review based on the author-reported validation above; this maintenance pass did not rerun tests. The CLA check passed. Fork CI is awaiting maintainer approval (action_required, 0 jobs); no CI jobs have run. AI assistance was used; the two-file diff and generated manifest were reviewed.

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused fix has regression coverage, and the targeted Python 3.12 compatibility check found no blocking issue.

Review effort: Balanced
Findings: None

What changed in this PR

Fixes Calc-X Minikube networking by separating the host controller’s gateway URL from the URL used by agent pods.

Changes:

• Uses localhost for the controller and host.minikube.internal for agents.
• Adds an isolated launcher regression test covering configuration overrides and generated pod URLs.

File	Description
tests/​examples/​test_calc_x_minikube.py	Tests launcher arguments, configuration, and Job manifest URLs.
examples/​calc_x/​run_minikube.sh	Sets separate host and agent gateway URLs.

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