Reduce remaining MCP and persistence debug detail

src/services/mcp/config.ts

@@ -1397,6 +1397,7 @@ export function parseMcpConfigFromFilePath(params: {
     configContent = fs.readFileSync(filePath, { encoding: 'utf8' })
   } catch (error: unknown) {
     const code = getErrnoCode(error)
+    const fileName = parse(filePath).base
     if (code === 'ENOENT') {
       return {
         config: null,
@@ -1415,7 +1416,7 @@ export function parseMcpConfigFromFilePath(params: {
       }
     }
     logForDebugging(
-      `MCP config read error for ${filePath} (scope=${scope}): ${error}`,
+      `MCP config read error (scope=${scope}, file=${fileName}, errno=${code ?? 'none'}, errorType=${error instanceof Error ? error.name : typeof error})`,
       { level: 'error' },
     )
     return {
@@ -1439,7 +1440,7 @@ export function parseMcpConfigFromFilePath(params: {
 
   if (!parsedJson) {
     logForDebugging(
-      `MCP config is not valid JSON: ${filePath} (scope=${scope}, length=${configContent.length}, first100=${jsonStringify(configContent.slice(0, 100))})`,
+      `MCP config is not valid JSON (scope=${scope}, file=${parse(filePath).base}, length=${configContent.length})`,
       { level: 'error' },
     )
     return {