docs: add AGENTS.md with AI agent instructions

[danships]

Consolidated cursor rules and commands into AGENTS.md for opencode compatibility. Includes guidelines for API routes, React/TSX components, TypeScript, and project architecture.

Summary by CodeRabbit

• Documentation
  • Added comprehensive AI agent instructions documentation covering project architecture, API route patterns, React component guidelines, TypeScript conventions, file structure, and testing practices.

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[coderabbitai]

Walkthrough

A new documentation file AGENTS.md was added containing detailed instructions for AI agents working with the Thoth codebase, covering project overview, API route patterns, React component guidelines, TypeScript conventions, file structure, and testing practices.

Changes

Cohort / File(s)	Summary
Documentation Addition AGENTS.md	New file with comprehensive agent guidelines including tech stack overview, API route creation patterns (type definitions, route implementations, validation with Zod), React/TSX component styling and error handling, TypeScript rules, file structure conventions, and testing/quality practices.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title clearly and specifically describes the main change: adding a new AGENTS.md documentation file with AI agent instructions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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