v2 restructure: Go client, Docker engine, release tooling

- Remove v1 Python CLI (src/kb_search/, tests/, root pyproject.toml, uv.lock, .venv)
- Add Go client with cross-platform build (client/)
- Add FastAPI engine with NVIDIA and multi-stage ROCm Dockerfiles (engine/)
- Add VERSION files for client and engine, wired into builds
- Add release.sh for automated build, tag, release, and Docker push
- Update README with build/release docs and ROCm migration note
- Clean up .gitignore for v2 project structure

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

client/cmd/remove.go

@@ -0,0 +1,63 @@
+package cmd
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/kb-search/kb/internal/api"
+	"github.com/kb-search/kb/internal/output"
+	"github.com/spf13/cobra"
+)
+
+var removeCmd = &cobra.Command{
+	Use:   "remove <id>",
+	Short: "Remove a document from the knowledge base",
+	Args:  cobra.ExactArgs(1),
+	RunE:  runRemove,
+}
+
+func init() {
+	removeCmd.Flags().BoolP("yes", "y", false, "skip confirmation prompt")
+	rootCmd.AddCommand(removeCmd)
+}
+
+func runRemove(cmd *cobra.Command, args []string) error {
+	yes, _ := cmd.Flags().GetBool("yes")
+
+	if !yes {
+		fmt.Printf("Remove document %s? [y/N] ", args[0])
+		reader := bufio.NewReader(os.Stdin)
+		answer, _ := reader.ReadString('\n')
+		answer = strings.TrimSpace(strings.ToLower(answer))
+		if answer != "y" && answer != "yes" {
+			fmt.Println("Cancelled.")
+			return nil
+		}
+	}
+
+	client := api.NewClient()
+	resp, err := client.Delete("/api/v1/documents/" + args[0])
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	if err := api.CheckError(resp); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+
+	if output.IsJSON() {
+		var raw interface{}
+		if err := api.DecodeJSON(resp, &raw); err != nil {
+			// Some DELETE endpoints return no body
+			output.PrintJSON(map[string]string{"status": "removed", "id": args[0]})
+			return nil
+		}
+		output.PrintJSON(raw)
+	} else {
+		fmt.Printf("Removed: %s\n", args[0])
+	}
+	return nil
+}