Add native MCP support for ordinary RightMemory use

[RightL]

Summary

• add a local stdio MCP server with exactly three ordinary-agent tools: retrieve, submit update evidence, and capture guidance evidence
• keep successful writes silent and surface only actionable save, scheduling, and manual-recovery warnings
• reuse the existing profile, project binding, environment, and default-root resolution
• make the MCP tool descriptions the complete ordinary-agent contract, so MCP clients do not also load an orchestrator skill
• lower guidance-capture filtering for both MCP and the CLI auto-orchestrator, including implicit redirections and repeated independent occurrences
• add read-only recovery detection, focused adapter tests, entrypoint coverage, and MCP usage documentation

Design boundaries

• Update submission remains asynchronous and never reports immediate semantic acceptance.
• The ordinary MCP surface does not expose queue management, guidance review, maintenance, or Streamable HTTP.
• CLI workflows remain available for non-MCP clients and explicit human operations.

Validation

• GitHub Actions: Python 3.11 on Ubuntu and Windows
• package compile and full python -m tests suite run in CI