feat(cli): enhance version command with JSON output and build info

Add --output json flag, build date, Go version, and OS/arch to the
version command. Update Makefile and goreleaser to inject build date.

.goreleaser.yml

@@ -11,6 +11,7 @@ builds:
       - -s -w
       - -X main.version={{.Version}}
       - -X main.commit={{.ShortCommit}}
+      - -X main.date={{.Date}}
     env:
       - CGO_ENABLED=0
     goos:

Makefile

@@ -190,10 +190,11 @@ multica:
 
 VERSION ?= $(shell git describe --tags --always --dirty 2>/dev/null || echo dev)
 COMMIT  ?= $(shell git rev-parse --short HEAD 2>/dev/null || echo unknown)
+DATE    ?= $(shell date -u '+%Y-%m-%dT%H:%M:%SZ')
 
 build:
 	cd server && go build -o bin/server ./cmd/server
-	cd server && go build -ldflags "-X main.version=$(VERSION) -X main.commit=$(COMMIT)" -o bin/multica ./cmd/multica
+	cd server && go build -ldflags "-X main.version=$(VERSION) -X main.commit=$(COMMIT) -X main.date=$(DATE)" -o bin/multica ./cmd/multica
 	cd server && go build -o bin/migrate ./cmd/migrate
 
 test:

scripts/install.sh

@@ -13,6 +13,7 @@ set -euo pipefail
 # Configuration
 # ---------------------------------------------------------------------------
 REPO_URL="https://github.com/multica-ai/multica.git"
+REPO_WEB_URL="https://github.com/multica-ai/multica"  # without .git, for GitHub web APIs
 INSTALL_DIR="${MULTICA_INSTALL_DIR:-$HOME/.multica/server}"
 BREW_PACKAGE="multica-ai/tap/multica"
 
@@ -62,10 +63,16 @@ install_cli_brew() {
   if ! brew tap multica-ai/tap 2>/dev/null; then
     fail "Failed to add Homebrew tap. Check your network connection."
   fi
+  # brew install exits non-zero if already installed on older Homebrew versions
   if ! brew install multica 2>/dev/null; then
-    fail "Failed to install multica via Homebrew."
+    if brew list multica >/dev/null 2>&1; then
+      ok "Multica CLI already installed via Homebrew"
+    else
+      fail "Failed to install multica via Homebrew."
+    fi
+  else
+    ok "Multica CLI installed via Homebrew"
   fi
-  ok "Multica CLI installed via Homebrew"
 }
 
 install_cli_binary() {
@@ -73,7 +80,7 @@ install_cli_binary() {
 
   # Get latest release tag
   local latest
-  latest=$(curl -sI "$REPO_URL/releases/latest" | grep -i '^location:' | sed 's/.*tag\///' | tr -d '\r\n')
+  latest=$(curl -sI "$REPO_WEB_URL/releases/latest" 2>/dev/null | grep -i '^location:' | sed 's/.*tag\///' | tr -d '\r\n' || true)
   if [ -z "$latest" ]; then
     fail "Could not determine latest release. Check your network connection."
   fi
@@ -123,7 +130,8 @@ add_to_path() {
 }
 
 get_latest_version() {
-  curl -sI "$REPO_URL/releases/latest" 2>/dev/null | grep -i '^location:' | sed 's/.*tag\///' | tr -d '\r\n'
+  # grep exits 1 when no match; use `|| true` to avoid triggering pipefail
+  curl -sI "$REPO_WEB_URL/releases/latest" 2>/dev/null | grep -i '^location:' | sed 's/.*tag\///' | tr -d '\r\n' || true
 }
 
 upgrade_cli_brew() {
@@ -140,7 +148,8 @@ upgrade_cli_brew() {
 install_cli() {
   if command_exists multica; then
     local current_ver
-    current_ver=$(multica version 2>/dev/null || echo "unknown")
+    # `multica version` outputs "multica v0.1.13 (commit: abc1234)" — extract just the version
+    current_ver=$(multica version 2>/dev/null | awk '{print $2}' || echo "unknown")
 
     local latest_ver
     latest_ver=$(get_latest_version)
@@ -162,7 +171,7 @@ install_cli() {
     fi
 
     local new_ver
-    new_ver=$(multica version 2>/dev/null || echo "unknown")
+    new_ver=$(multica version 2>/dev/null | awk '{print $2}' || echo "unknown")
     ok "Multica CLI upgraded ($current_ver → $new_ver)"
     return 0
   fi
@@ -217,6 +226,11 @@ setup_server() {
     if ! command_exists git; then
       fail "Git is not installed. Please install git and re-run."
     fi
+    # Remove leftover directory from a previously interrupted clone
+    if [ -d "$INSTALL_DIR" ]; then
+      warn "Removing incomplete installation at $INSTALL_DIR..."
+      rm -rf "$INSTALL_DIR"
+    fi
     mkdir -p "$(dirname "$INSTALL_DIR")"
     git clone --depth 1 "$REPO_URL" "$INSTALL_DIR"
     cd "$INSTALL_DIR"

server/cmd/multica/cmd_update.go

@@ -17,7 +17,7 @@ var updateCmd = &cobra.Command{
 }
 
 func runUpdate(_ *cobra.Command, _ []string) error {
-	fmt.Fprintf(os.Stderr, "Current version: %s (commit: %s)\n", version, commit)
+	fmt.Fprintf(os.Stderr, "Current version: %s (commit: %s, built: %s)\n", version, commit, date)
 
 	// Check latest version from GitHub.
 	latest, err := cli.FetchLatestRelease()

server/cmd/multica/cmd_version.go

@@ -1,15 +1,42 @@
 package main
 
 import (
+	"encoding/json"
 	"fmt"
+	"os"
+	"runtime"
 
 	"github.com/spf13/cobra"
 )
 
+func init() {
+	versionCmd.Flags().String("output", "text", "Output format: text or json")
+}
+
 var versionCmd = &cobra.Command{
 	Use:   "version",
 	Short: "Print version information",
-	Run: func(_ *cobra.Command, _ []string) {
-		fmt.Printf("multica %s (commit: %s)\n", version, commit)
-	},
+	RunE:  runVersion,
+}
+
+func runVersion(cmd *cobra.Command, _ []string) error {
+	output, _ := cmd.Flags().GetString("output")
+
+	if output == "json" {
+		info := map[string]string{
+			"version":   version,
+			"commit":    commit,
+			"date":      date,
+			"go":        runtime.Version(),
+			"os":        runtime.GOOS,
+			"arch":      runtime.GOARCH,
+		}
+		enc := json.NewEncoder(os.Stdout)
+		enc.SetIndent("", "  ")
+		return enc.Encode(info)
+	}
+
+	fmt.Printf("multica %s (commit: %s, built: %s)\n", version, commit, date)
+	fmt.Printf("go: %s, os/arch: %s/%s\n", runtime.Version(), runtime.GOOS, runtime.GOARCH)
+	return nil
 }

server/cmd/multica/main.go

@@ -10,6 +10,7 @@ import (
 var (
 	version = "dev"
 	commit  = "unknown"
+	date    = "unknown"
 )
 
 var rootCmd = &cobra.Command{