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/qwen_sources.go

@@ -4,10 +4,13 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"regexp"
 	"runtime"
 	"strings"
 )
 
+var qwenPathSeparatorPattern = regexp.MustCompile(`[/\\]+`)
+
 var qwenHomeEnvironmentKeys = [...]string{"QWEN_HOME", "QWEN_RUNTIME_DIR"}
 
 type qwenDisableControl struct {
@@ -154,7 +157,7 @@ func resolveQwenRouting() (*qwenRoutingResult, error) {
 		if resolveErr != nil {
 			return nil, resolveErr
 		}
-		if !sameQwenPath(discoveredDirectory, initialDirectory) {
+		if !sameManagedPath(discoveredDirectory, initialDirectory) {
 			if err := readCandidate(filepath.Join(discoveredDirectory, ".env")); err != nil {
 				return nil, err
 			}