feat: build CLI core framework with Commander.js

Add CLI entry point with Commander.js, config management (~/.mcpctl/config.json
with Zod validation), output formatters (table/json/yaml), config and status
commands with dependency injection for testing. Fix sanitizeString regex ordering.
67 tests passing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.taskmaster/tasks/tasks.json

@@ -475,7 +475,7 @@
         "dependencies": [
           "1"
         ],
-        "status": "pending",
+        "status": "done",
         "subtasks": [
           {
             "id": 1,
@@ -499,7 +499,8 @@
             "testStrategy": "TDD tests for config loading, saving, validation, and credential encryption.",
             "parentId": "undefined"
           }
-        ]
+        ],
+        "updatedAt": "2026-02-21T04:17:17.744Z"
       },
       {
         "id": "8",
@@ -729,9 +730,9 @@
     ],
     "metadata": {
       "version": "1.0.0",
-      "lastModified": "2026-02-21T04:10:25.433Z",
+      "lastModified": "2026-02-21T04:17:17.744Z",
       "taskCount": 24,
-      "completedCount": 2,
+      "completedCount": 3,
       "tags": [
         "master"
       ]