chore(go): audit providers kirocli kiroide opencode

Move Kiro IDE onto managed_runtime.go and shell_command.go, share
cloneJSONObject across providers, make OpenCode status verify the managed
runtime contract instead of any hook.js, propagate script removal errors,
and build the legacy runtime config through buildManagedRuntimeConfig.

Claude-Session: https://claude.ai/code/session_01Agoc9bRVE9KL7mmWtey9Vq

cmd/elydora/plugins/jsonutil.go

@@ -2,6 +2,7 @@ package plugins
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -49,6 +50,20 @@ func hookScriptPath(agentId string) (string, error) {
 	return filepath.Join(agentDirectory, "hook.js"), nil
 }
 
+// removeAgentScripts deletes hook.js and guard.js; missing files are fine.
+func removeAgentScripts(agentID string) error {
+	for _, resolve := range []func(string) (string, error){hookScriptPath, guardScriptPath} {
+		path, err := resolve(agentID)
+		if err != nil {
+			return err
+		}
+		if err := os.Remove(path); err != nil && !errors.Is(err, os.ErrNotExist) {
+			return fmt.Errorf("remove %s: %w", path, err)
+		}
+	}
+	return nil
+}
+
 // guardScriptPath returns ~/.elydora/<agentId>/guard.js.
 func guardScriptPath(agentId string) (string, error) {
 	agentDirectory, err := ResolveAgentRuntimeDirectory(agentId)