refactor: rename "bare metal" to "native host" across codebase

[shiv-tyagi]

Summary

• Replaces all occurrences of "bare metal" / "bare-metal" / BareMetal / bare_metal with the equivalent "native host" form throughout code and documentation.
• The old term was misleading since the deployment mode works identically on VMs — "native host" accurately describes running directly on the host OS regardless of whether the underlying machine is physical or virtual.
• Renames directories (deploy/bare-metal → deploy/native-host, test module bare_metal → native_host), Rust identifiers (BareMetal → NativeHost, BareMetalFixture → NativeHostFixture), CI workflow references, and docs.

Test plan

• cargo check passes
• cargo fmt --check --all clean
• CI E2E workflows validate updated paths

[Copilot]

Pull request overview

This PR renames the native deployment mode terminology from “bare metal” to “native host” across Rust identifiers, tests, CI workflows, deployment assets, and documentation.

Changes:

• Renames NodeSource::BareMetal, the E2E test module, and fixtures to NativeHost / native_host.
• Updates deployment/docs paths from deploy/bare-metal and bare-metal.rst to deploy/native-host and native-host.rst.
• Updates CI workflow names, test filters, artifact names, and release packaging references.

Reviewed changes

Copilot reviewed 30 out of 39 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
README.md	Updates deployment guide link.
plans/implementation-roadmap.md	Updates roadmap terminology.
docs/developer/building.rst	Updates E2E test docs and commands.
docs/deployment/native-host.rst	Renames deployment guide title.
docs/deployment/index.rst	Updates deployment toctree entry.
deploy/native-host/spur.conf	Native-host deployment example config.
deploy/native-host/setup-runner.sh	Native-host runner setup script.
deploy/native-host/inference_test.py	Native-host GPU inference test asset.
deploy/native-host/inference_job.sh	Native-host inference job wrapper.
deploy/native-host/gpu_test.hip	Native-host HIP GPU test asset.
deploy/native-host/distributed_test.py	Native-host distributed PyTorch test asset.
deploy/native-host/distributed_job.sh	Native-host distributed job wrapper.
deploy/native-host/deploy.sh	Native-host deployment script.
deploy/native-host/cluster_test.sh	Updates usage path comment.
crates/spurd/src/landlock.rs	Updates isolation documentation terminology.
crates/spurctld/src/server.rs	Registers nodes as NativeHost.
crates/spurctld/src/cluster.rs	Updates tests to use NativeHost.
crates/spur-tests/src/native_host/ssh.rs	Native-host SSH test helper.
crates/spur-tests/src/native_host/single_node/mod.rs	Renames single-node fixture imports/types.
crates/spur-tests/src/native_host/single_node/lifecycle.rs	Updates native-host test imports.
crates/spur-tests/src/native_host/single_node/jobs.rs	Updates native-host test imports/references.
crates/spur-tests/src/native_host/single_node/container.rs	Updates native-host test imports/references.
crates/spur-tests/src/native_host/multi_node/scheduling.rs	Updates native-host test imports.
crates/spur-tests/src/native_host/multi_node/mod.rs	Renames multi-node fixture imports/types.
crates/spur-tests/src/native_host/multi_node/dispatch.rs	Updates native-host test imports.
crates/spur-tests/src/native_host/multi_node/container.rs	Updates native-host test imports.
crates/spur-tests/src/native_host/mod.rs	Renames shared fixture type references.
crates/spur-tests/src/native_host/gpu/single_node.rs	Updates native-host GPU test imports.
crates/spur-tests/src/native_host/gpu/multi_node.rs	Updates native-host GPU test imports.
crates/spur-tests/src/native_host/gpu/mod.rs	Renames GPU fixture imports/types.
crates/spur-tests/src/native_host/fixture.rs	Renames fixture type/helper and deploy path.
crates/spur-tests/src/native_host/config.rs	Updates config documentation terminology.
crates/spur-tests/src/lib.rs	Exposes native_host test module.
crates/spur-k8s/src/heartbeat.rs	Updates comment terminology.
crates/spur-core/src/node.rs	Renames NodeSource variant and docs.
crates/spur-core/src/config.rs	Updates isolation config documentation terminology.
.github/workflows/release.yml	Updates packaged config path.
.github/workflows/nightly.yml	Updates nightly packaged config path.
.github/workflows/e2e.yml	Renames native-host E2E workflow job, paths, commands, and artifact.

Comments suppressed due to low confidence (1)

docs/deployment/native-host.rst:2

• This title is longer than its reStructuredText underline, which causes Sphinx/docutils to warn that the title underline is too short. Extend the underline to at least the title length after the rename.

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[sgopinath1]

LGTM