chore: prepare OpenDomain 0.1.0-rc.1

[chasechou007]

Summary

• prepare the exact 0.1.0-rc.1 compatibility candidate from the canonical source-first projection
• move the forward release line to Apache-2.0 while preserving 0.1.0-alpha.10 and earlier as immutable MIT history
• align package metadata, lockfile, changelog, public installation/usage guidance, and RC-aware validation assertions
• use the explicit npm rc channel, which must not move latest

Compatibility surface

This RC rehearses the intended first-stable surface: published Markdown/YAML schemas, Grounding Protocol v1, Core API 1.0, opendomain.context-export.v1, existing CLI/exit semantics, workspace resolution, and package-neutral npm/standalone behavior.

Validation

• deterministic projection: 142 files / 744,547 bytes, inventory 1af1a00c3a3bbf10f5eb1054e88587ba7e48ad0f70d4e2c0891cf8b9387f005a
• parity against main@44f0250: 126 identical / 16 reviewed intentional / 0 unexpected
• Node 20 and Node 22: 226/226 tests, validate, installed-package smoke, Agent bootstrap
• Node 24.18.0 standalone build/smoke
• npm pack dry-run: 72 entries / 104,378 bytes; audit: 0 vulnerabilities / 39 dependencies
• real corpus compatibility: Zimi PDM 32 docs, KeptNear 22 docs, EchoPath 8 docs; zero errors/warnings

Approval boundary

This Draft PR is remote-integration evidence only. It does not authorize Ready-for-review, merge, main update, tag creation, npm publication or dist-tag changes, GitHub Release/standalone asset publication, branch-protection changes, repository lifecycle changes, or OpenSpec archive.