feat: add standalone CLI distribution

[chasechou007]

Summary

• add a Node SEA standalone CLI build with packaged schemas and ERP example assets
• build and smoke-test versioned binaries on macOS arm64/x64, Linux x64, and Windows x64
• assemble checksum-verified GitHub Release assets under a least-privilege workflow
• document direct binary installation, supported systems, signing limits, and npm/source alternatives

Verification

• Node 20, 22, and 24.18.0: 178/178 tests pass on each runtime
• macOS arm64 SEA build, full binary smoke, codesign verification, and architecture check pass locally
• OpenDomain validation: 26 documents pass with one known stale Candidate warning
• OpenSpec validation: 9/9 items pass
• npm pack dry-run: 59 consumer files; no private OpenSpec or standalone maintainer scripts
• independent final review: no P0-P3 findings

Release boundary

This PR adds build and validation capability only. It does not publish an npm version, create a GitHub Release, or create the Homebrew Tap.

[chasechou007]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Another round soon, please!

Reviewed commit: 961900ca22

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