OpenCoven Publishes Orchestration Architecture Docs

The OpenCoven orchestration documentation was updated into a coherent handoff package for harness-to-harness work.

Highlights:

• Updated architecture, glossary, roadmap, and API contract docs.
• Documented the Phase 1 direction for harness handoffs and context transfer.
• Audited public terminology and project framing for consistency.
• Prepared a practical implementation handoff for the next orchestration pass.