docs: refresh readme roadmap

[Chris-godz]

Summary

• mark Phase 1 complete in both READMEs and call out the delivered repository workflow loop
• replace the old skills-focused Phase 2 list with a local Agent Harness breakdown
• move control plane and external channel work into a dedicated Phase 3 and sync the Chinese roadmap copy

Testing

• not run (docs-only change)

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[gemini-code-assist]

Summary of Changes

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This pull request updates the project's roadmap documentation in both English and Chinese READMEs. It formally marks Phase 1 as complete, detailing the in-repository coding workflow loop that has been delivered. Furthermore, it refines the future development plan by restructuring Phase 2 to focus on building a comprehensive local Agent Harness and introducing a new Phase 3 dedicated to Agent Boundary Expansion and Control Plane functionalities.

Highlights

• Roadmap Completion: Phase 1 has been marked as complete in both the English and Chinese READMEs, explicitly calling out the delivered in-repository coding workflow loop.
• Phase 2 Redefinition: The previous skills-focused Phase 2 has been replaced with a detailed breakdown for building a local Agent Harness, encompassing Stateful Core, Extensibility, Orchestration, Robustness, and Real-Model Harness layers.
• New Phase 3 Introduction: A dedicated Phase 3 has been introduced to cover Agent Boundary Expansion and Control Plane work, including Channel Adapter Layer, Human-in-the-Loop Control Plane, UI / Trace Console, and Remote Execution / Agent Daemon.
• Documentation Synchronization: The Chinese roadmap copy (README_zh.md) has been fully synchronized with the English updates, ensuring consistency across languages.

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[gemini-code-assist]

Code Review

This pull request updates the README.md and README_zh.md files to reflect the completion of Phase 1 of the project roadmap. It also significantly revises the descriptions and goals for Phase 2 and introduces a new Phase 3, providing a more detailed and structured future roadmap. The "Future Directions" section is also updated to align with the new roadmap structure. There is no feedback to provide.