Revert PR #287 - Fix chat prototype build

[devin-ai-integration]

Revert PR #287 - Fix chat prototype build

Summary

This PR reverts the entire chat prototype functionality that was added in PR #287. The revert removes:

• Chat interface and components (app/chat/* - 15 files)
• API endpoints for sessions, tutorials, and user state (app/api/* - 7 files)
• Agent infrastructure (agent-docs/src/agents/agent-pulse/* - 9 files)
• Tutorial management system (lib/tutorial/* - 5 files)
• Supporting utilities and components (CodeEditor, SessionContext, etc.)
• Package dependencies (node-pty, swr, uuid, allotment, @types/uuid, zod 4.x → 3.x)

This is a clean revert of commit 96d0124 that restores the documentation site to its pre-chat prototype state.

Review & Testing Checklist for Human

⚠️ High Risk Items (3):

• Build verification: Run npm run build and npm run build:worker to ensure no orphaned imports or missing dependencies
• Basic site functionality: Test that the docs site loads correctly at localhost:3201 and key pages render properly
• Dependency cleanup: Verify that no remaining code references the removed packages (node-pty, swr, uuid, etc.)

Notes

• This revert was requested by srith@agentuity.com to resolve the OpenTelemetry instrumentation hook errors in Cloudflare Workers deployment
• The agent-docs directory will be deployed separately going forward
• Session: https://app.devin.ai/sessions/fa7202af4b6245d9b785fd8aafddb7e9
• Requested by: @afterrburn

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