chore: add AGENTS.md files

[fortuna]

I'm hoping this will make it easier to use AI agents.

[Copilot]

Pull Request Overview

This PR adds documentation files for AI agents across the Outline monorepo to improve development workflow and onboarding. The documentation provides structural overviews, build instructions, and development guidelines for each major component.

• Added AGENTS.md files to root directory and three main components (client, server_manager, infrastructure)
• Documented directory structures, key technologies, and build/test commands for each component
• Provided comprehensive guide for the custom npm run action build system

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
AGENTS.md	Root-level guide introducing the monorepo structure and common npm run action commands
client/AGENTS.md	Client-specific documentation covering Electron, Cordova, and web development workflows
server_manager/AGENTS.md	Server Manager documentation for web and Electron app development
infrastructure/AGENTS.md	Infrastructure documentation explaining the build system and action creation

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[daniellacosse]

This is a good start. FYI, you've also been using github copilot - I don't think it supports AGENTS.md (they only crawl the files they're told to crawl), but I think you can add a file at .github/copilot-instructions.md and simply point it to the AGENTS.md file. Something like this to start:

# Copilot Instructions

## Project Overview
This project contains an architectural overview and rules of conduct in several `AGENTS.md` files.

## File Locations
- `AGENTS.md`
- `cilent/AGENTS.md`
- `infrastruction/AGENTS.md`
- `server_manager/AGENTS.md`

## Expectations
Always reference `AGENTS.md` for guidance on:
- Project structure
- Common concepts
- Technologies uesd
- Additional reosources

[fortuna]

Thanks for the feedback. I put this in draft because I realized that there's too much overlap with the README files. I don't think it makes sense to maintain both.

I think a better approach will be to cleanup the READMEs to make it more helpful for both humans and AI, and create symlinks from AGENTS.md to the README.

I haven't been using copilot to generate code, so it doesn't matter much to me, but we could also add the copilot file as a symlink.

[daniellacosse]

Thanks for the feedback. I put this in draft because I realized that there's too much overlap with the README files. I don't think it makes sense to maintain both.

I think a better approach will be to cleanup the READMEs to make it more helpful for both humans and AI, and create symlinks from AGENTS.md to the README.

I haven't been using copilot to generate code, so it doesn't matter much to me, but we could also add the copilot file as a symlink.

I like this approach for now, though I think people have been decoupling them because it allows human-facing documentation to be warmer/fuller (more human-friendly) while agent-facing documentation can be specifically optimized for LLMs (sometimes with weirdly specific or redundant phrasing they respond better to)

[fortuna]

@ohnorobo this is ready for review. I've fixed a bunch of things and improved it.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 10 changed files in this pull request and generated 2 comments.

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