Refactor: centralize AI instructions and opencode config into common dotfiles

dotfiles/common/.config/ai/knowledge/architecture.md

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+# Architecture
+
+core system → user environment
+
+- Keep separation strict
+- Avoid mixing concerns
+- Systems must remain understandable

dotfiles/common/.config/ai/knowledge/cli.md

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+# CLI
+
+- Bash + tmux + fzf
+- Keyboard-driven workflow
+- Minimal and efficient

dotfiles/common/.config/ai/knowledge/desktop.md

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+# Desktop
+
+- i3 primary
+- XFCE components selectively

dotfiles/common/.config/ai/knowledge/dotfiles.md

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+# Dotfiles
+
+- Managed via stow
+- Layering: common → profile → host
+- Must remain portable

dotfiles/common/.config/ai/knowledge/emacs.md

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+# Emacs
+
+- Primary editor
+- LSP for C, Go, Python
+- Modular configuration

dotfiles/common/.config/ai/knowledge/infra.md

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+# Infrastructure
+
+- Tool: Ansible
+- Layering: common → OS → profile → host
+- Idempotency is mandatory
+- Single-host validation before rollout

dotfiles/common/.config/ai/knowledge/kernel.md

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+# Kernel
+
+- Learning kernel modules
+- Debugging with GDB
+- Understanding internals

dotfiles/common/.config/ai/knowledge/os_setup.md

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+# OS Setup
+
+- Preferred:
+  - Arch (reference)
+  - Void (minimal)
+  - Debian/Ubuntu (work)
+
+- Disk:
+  - EFI + LUKS2 + btrfs
+
+- Init:
+  - runit (Void)
+  - systemd (others)

dotfiles/common/.config/ai/knowledge/philosophy.md

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+# Philosophy
+
+- UNIX
+- Minimalism
+- Reproducibility
+- Control over convenience

dotfiles/common/.config/ai/knowledge/server.md

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+# Server
+
+- Ubuntu minimal server
+- Self-hosting services
+- Low attack surface

dotfiles/common/.config/ai/knowledge/system_programming.md

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+# System Programming
+
+- Language: C
+- Focus: UNIX APIs
+- Practice: small tools and exercises