2.0.0 - Shared Memory Across Codex and OpenCode

EchoesVault for OpenCode 2.0.0

Major update introducing EchoesVault Protocol 1.0.0 compatibility.

• Shared repository-local runtime with Codex and other agents
• Conflict-safe daily logs and deterministic index generation
• Atomic writes and SHA-256 protection for page updates
• Unified local state and improved TUI status
• Explicit, safe migration from OpenCode 1.x
• No repository changes during plugin installation
  After updating, run /echoes-init once in existing repositories to migrate them. Python 3.9+ is required.