chore(go): audit providers kimi grok qwen letta

Move Kimi, Grok, and Qwen onto managed_runtime.go and shell_command.go;
share the encoded and shell command builders and the quoted Windows
legacy parser with Droid; split managed_changes.go; dedupe Letta's hook
entry filtering and stop swallowing settings read errors.

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

cmd/elydora/plugins/grok.go

@@ -36,11 +36,11 @@ func (p *GrokPlugin) Install(config InstallConfig) error {
 	if err != nil {
 		return err
 	}
-	guardCommand, err := buildGrokCommand(nodePath, paths.guardPath)
+	guardCommand, err := buildEncodedCommand("Grok", nodePath, paths.guardPath)
 	if err != nil {
 		return err
 	}
-	auditCommand, err := buildGrokCommand(nodePath, paths.auditPath)
+	auditCommand, err := buildEncodedCommand("Grok", nodePath, paths.auditPath)
 	if err != nil {
 		return err
 	}