Replace Windows Cargo check with Bazel CI

[Copilot]

Summary

• Build the Bazel workspace on native Windows for every pull request and push, covering cfg(windows) code.
• Keep the full Windows test suite opt-in via workflow_dispatch with run_os=true.

Motivation

The Linux Cargo check was the only automatic Windows compilation path, outside the workspace’s Bazel build authority.

Changes

• Replace the Clippy job’s Cargo check and Cargo-only setup with a native Windows Bazel build:

  bazel build --config=ci //...

• Reuse the existing Windows runner; retain its full Bazel test journey for explicit OS dispatches.

Test plan

• The affected Bazel targets pass
• bazel build //... passes when the change crosses package boundaries
• Tested manually (describe below if applicable)

Checklist

• CHANGELOG.md updated (under [Unreleased] if no version bump)
• No secrets, credentials, or .env files included
• Breaking changes documented (if any)

• Fixes Replace CI's Windows cargo check with a Linux-hosted Windows Bazel check #4324

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Latest commit: e4e019c

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