Obligation-First v0.6.3

Repairs public and agent discovery surfaces and adds deterministic link, feed, sitemap, and version-drift gates without changing v0.6 semantics.

• manifest.json - machine-readable release package manifest
• sha256.txt - SHA-256 checksum index
• RELEASE_NOTES-v0.6.3.md - release notes and verification summary
• /v1/context.jsonld - JSON-LD context
• /v1/schema/ - JSON Schemas
• /.well-known/assistant-guide.txt - GuideCheck assistant guide

Full changelog