Migrate from Claude Code to OpenCode structure

- Move legacy content to legacy/ folder (old, old2, docs, learnings, scripts)
- Create new .opencode/ structure with skills/, tools/, agents/ folders
- Update Makefile to symlink to ~/.config/opencode/ instead of ~/.claude/
- Update Makefile to manage skills, tools, and agents (remove settings.json)
- Simplify install/uninstall (no backup logic)
- Add README.md documenting the new structure
- Keep settings.json as historical reference

legacy/old2/skills/setup.md

@@ -0,0 +1,49 @@
+# Gitea CLI Setup
+
+One-time installation and authentication setup for `tea` CLI.
+
+## Installation
+
+```bash
+brew install tea
+```
+
+## Authentication
+
+The `tea` CLI authenticates via `tea logins add`. Credentials are stored locally by tea.
+
+```bash
+tea logins add                       # Interactive login
+tea logins add --url <url> --token <token> --name <name>  # Non-interactive
+tea logins list                      # Show configured logins
+tea logins default <name>            # Set default login
+```
+
+## Configuration
+
+Config is stored at `~/Library/Application Support/tea/config.yml` (macOS).
+
+To avoid needing `--login` on every command, set defaults:
+
+```yaml
+preferences:
+    editor: false
+    flag_defaults:
+        remote: origin
+        login: git.flowmade.one
+```
+
+## Example: Flowmade One Setup
+
+```bash
+# Install
+brew install tea
+
+# Add login (get token from https://git.flowmade.one/user/settings/applications)
+tea logins add --name flowmade --url https://git.flowmade.one --token <your-token>
+
+# Set as default
+tea logins default flowmade
+```
+
+Now `tea` commands will automatically use the flowmade login when run in a repository with a git.flowmade.one remote.