Record public Windows physics artifacts

[snkmcb]

Summary

• Record that the Windows physicsCore and physicsJolt artifacts are publicly pullable by exact OCI and content digests.
• Correct the documented Windows Jolt ABI flags to match the published artifact.
• Propose a versioned release schema informed by usd-motion-plugins: one OCI repository, per-library/target artifacts, a complete digest pin table generated from actual pushes, dry-run mode, and tag-only promotion gates.
• Keep the current Windows artifacts distinct from a formal v0.1.0 release; Linux artifacts, downstream consumer evidence, and a tested release workflow remain pending.

Verification

• Anonymous fresh-cache pulls verified both Windows artifacts with the matching pinned runtime.
• Latest physics hosted Windows, Linux, and graph CI checks passed.
• Codex review against origin/main found no actionable defect; git diff --check passed.