docs: add documentation for beads, n8n, opencode packages

- Update AGENTS.md header with current commit (366af12) and date (2026-01-13)
- Add beads, n8n, opencode to README.md Available Packages table
- Update docs/README.md packages list
- Create docs/packages/beads.md (220 lines)
- Create docs/packages/n8n.md (310 lines)
- Create docs/packages/opencode.md (346 lines)

Documentation now reflects commit bc75505 which added these three packages.

docs/README.md

@@ -28,11 +28,14 @@ Step-by-step guides for common tasks:
 
 Documentation for all custom packages:
 
+- [beads](./packages/beads.md) - Lightweight memory system for AI coding agents with graph-based issue tracking
 - [code2prompt](./packages/code2prompt.md) - Convert code to prompts
 - [hyprpaper-random](./packages/hyprpaper-random.md) - Random wallpaper setter for Hyprpaper
 - [launch-webapp](./packages/launch-webapp.md) - Launch web applications
 - [mem0](./packages/mem0.md) - AI memory assistant with vector storage
 - [msty-studio](./packages/msty-studio.md) - Msty Studio application
+- [n8n](./packages/n8n.md) - Free and source-available fair-code licensed workflow automation tool
+- [opencode](./packages/opencode.md) - AI coding agent built for terminal
 - [pomodoro-timer](./packages/pomodoro-timer.md) - Pomodoro timer utility
 - [rofi-project-opener](./packages/rofi-project-opener.md) - Rofi-based project launcher with custom args
 - [stt-ptt](./packages/stt-ptt.md) - Push to Talk Speech to Text using Whisper