Better agent agent instructions

[Soph]

This adds a new requirement checklist for any new agent integration. It should be use to do a final validation (by humans and coding agents) against an agent implementation.

They are probably things missing and we will add more when they come up

[cursor]

PR Summary

Low Risk
Documentation-only changes with no impact on runtime behavior or data handling.

Overview
Adds a new docs/architecture/agent-integration-checklist.md that codifies requirements for integrating new agents, covering full transcript capture, native-format storage, required hook events, rewind/resume expectations, and suggested test scenarios.

Updates CLAUDE.md to reference this checklist from the cmd/entire/cli/agent directory description.

^{Written by Cursor Bugbot for commit 9cff81c. Configure here.}

[Copilot]

Pull request overview

This PR adds comprehensive documentation for integrating new AI coding agents with the Entire CLI. The checklist establishes key architectural principles (full transcript storage, native format preservation) and provides requirements for agent implementations to follow. The documentation is referenced from CLAUDE.md to help developers understand the agent integration architecture.

Changes:

• Adds new agent integration checklist document with requirements and testing guidelines
• Updates CLAUDE.md to reference the new checklist documentation
• Provides examples for both file-based agents (Claude Code, Gemini CLI) and hypothetical database-backed agents (OpenCode)

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 8 comments.

File	Description
docs/architecture/agent-integration-checklist.md	New checklist document defining requirements for agent integrations including transcript capture, session storage, hook events, and testing guidelines
CLAUDE.md	Adds reference to the agent integration checklist in the Key Directories section

[squishykid]

used these to improve the cursor integration!