chore: simplify Phase 3 code and bump version to v0.3.0

- Deduplicate server resolution logic in listCmd and statsCmd (use resolveServer)
- Mark unused helpText param as _ in tui/keys.go
- Bump version from 0.2.0 to 0.3.0
- Update CLAUDE.md with Phase 3 packages and commands

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: chuongld20

CLAUDE.md

@@ -9,13 +9,17 @@ Go CLI tool that turns any Linux machine into a ready-to-use dev environment in
 - `internal/server/` — Server pool management (add/remove/list/health), least-loaded selector
 - `internal/workspace/` — Workspace model, Manager interface, resource limits, user-scoped naming
 - `internal/tailscale/` — Tailscale Manager interface (serve/unserve/status)
+- `internal/tui/` — Interactive TUI dashboard with Bubble Tea (workspace list, logs viewer, keyboard navigation)
+- `internal/template/` — Workspace templates system (built-in + user-defined, YAML-based)
+- `internal/snapshot/` — Snapshot & restore workspace state (Docker volumes, compressed tar archives)
+- `internal/metrics/` — Resource metrics collector (CPU, memory, disk, network I/O per workspace/server)
 - `internal/integration/` — Multi-user integration tests (build tag: integration)
 - `internal/testutil/` — Shared test helpers for SSH, Docker, assertions
 - `.claude/specs/` — Product vision and design documents
 
 ## Key Patterns
 - **Cobra CLI**: All commands defined as funcs returning `*cobra.Command`, wired in `main()`
-- **Interface-driven**: `workspace.Manager`, `tailscale.Manager`, `identity.Resolver`, `port.Registry`, `server.Pool` define contracts
+- **Interface-driven**: `workspace.Manager`, `tailscale.Manager`, `identity.Resolver`, `port.Registry`, `server.Pool`, `metrics.Collector`, `snapshot.Manager` define contracts
 - **Config**: Per-project `devbox.yaml` parsed into `DevboxConfig` struct with yaml tags; `name` and `server` are required fields
 - **Error wrapping**: `fmt.Errorf("context: %w", err)` for all error propagation
 - **Single binary**: No runtime dependencies, cross-compile with `GOOS`/`GOARCH`
@@ -33,4 +37,8 @@ go vet ./...                        # Lint
 ./devbox up [project]               # Start workspace (auto-selects server, resolves user)
 ./devbox stop|list|destroy|ssh      # Workspace lifecycle commands
 ./devbox server add|remove|list     # Server pool management
+./devbox tui                        # Interactive TUI dashboard
+./devbox template list|create       # Workspace templates
+./devbox snapshot|restore           # Snapshot & restore workspace state
+./devbox stats [workspace]          # Resource metrics
 ```

cmd/devbox/main.go

@@ -29,7 +29,7 @@ import (
 )
 
 var (
-	version = "0.2.0"
+	version = "0.3.0"
 	verbose bool
 	noColor bool
 )
@@ -682,30 +682,9 @@ func statsCmd() *cobra.Command {
 		RunE: func(cmd *cobra.Command, args []string) error {
 			serverFlag, _ := cmd.Flags().GetString("server")
 
-			if serverFlag == "" {
-				cfg, err := config.LoadFromDir(".")
-				if err == nil {
-					serverFlag = cfg.Server
-				}
-			}
-
-			// Resolve server name from pool.
-			if serverFlag != "" {
-				configPath, _ := server.DefaultConfigPath()
-				if pool, err := server.NewFilePool(configPath, nil); err == nil {
-					if servers, err := pool.List(); err == nil {
-						for _, srv := range servers {
-							if srv.Name == serverFlag {
-								serverFlag = server.SSHHost(&srv)
-								break
-							}
-						}
-					}
-				}
-			}
-
-			if serverFlag == "" {
-				return fmt.Errorf("devbox stats: no server specified — use --server flag or create devbox.yaml")
+			host, err := resolveServer(serverFlag)
+			if err != nil {
+				return fmt.Errorf("devbox stats: %w", err)
 			}
 
 			sshExec, err := devboxssh.New()
@@ -720,7 +699,7 @@ func statsCmd() *cobra.Command {
 			if len(args) == 1 {
 				// Single workspace mode.
 				container := args[0]
-				wm, err := collector.CollectWorkspace(ctx, serverFlag, container)
+				wm, err := collector.CollectWorkspace(ctx, host, container)
 				if err != nil {
 					return fmt.Errorf("devbox stats: %w", err)
 				}
@@ -733,7 +712,7 @@ func statsCmd() *cobra.Command {
 			}
 
 			// Server overview mode.
-			sm, err := collector.CollectServer(ctx, serverFlag)
+			sm, err := collector.CollectServer(ctx, host)
 			if err != nil {
 				return fmt.Errorf("devbox stats: %w", err)
 			}

internal/tui/keys.go

@@ -68,6 +68,6 @@ func DefaultKeyMap() KeyMap {
 }
 
 // helpText returns a formatted help string for the help bar.
-func helpText(km KeyMap) string {
+func helpText(_ KeyMap) string {
 	return "  s:start  x:stop  d:destroy  enter:ssh  l:logs  r:refresh  /:filter  q:quit"
 }