Add WireGuard TUI implementation

- Add Go TUI with bubbletea for WireGuard management
- Implement client CRUD operations with QR code generation
- Add configuration and validation modules
- Install/update scripts for client setup
- Update Makefile to build binaries to bin/ directory
- Add .gitignore for Go projects

.agent/explore.md

@@ -0,0 +1,46 @@
+# Explore Agent - Project-Specific Instructions
+
+## Your Role in This Project
+
+You are the codebase exploration expert for the wg-admin project.
+
+## Project Context
+
+- **Primary issue tracking**: `bd` (beads) CLI
+- **External issue tracking**: Gitea API at https://gitea.calmcacil.dev
+- **Key directories**:
+  - `.agent/` - Project-specific agent instructions
+  - `.beads/` - Beads issue tracking data
+  - `wireguard.sh` - Main script for WireGuard management
+
+## When to Use
+
+Use the explore agent when you need to:
+- Understand code structure and organization
+- Find where specific functionality is implemented
+- Identify patterns across the codebase
+- Locate files matching specific criteria
+- Understand the project architecture
+
+## Workflow
+
+1. **Read `.agent/AGENTS.md`** first for project mandates
+2. Use grep and glob tools for codebase exploration
+3. Provide clear, concise findings with file paths and line numbers
+4. If you find issues, consider creating beads issues for follow-up work
+
+## Key Search Targets
+
+- WireGuard configuration handling
+- Firewall rule management
+- Peer connection logic
+- Configuration file parsing/generation
+- Error handling patterns
+
+## Output Format
+
+When reporting findings:
+- Use `file_path:line_number` format for references
+- Keep descriptions concise and actionable
+- Highlight patterns, not just locations
+- Note any code smells or anti-patterns you discover