client/cascades: n.castro cleanup, share docs, hook path fix

- active-directory.md: disable n.castro (AD + M365), fix stale Alma.Montt
  pending entry (she is intentionally cloud-only), restructure SMB shares
  section into new Phase 2.5 / legacy / system buckets (verified live via
  GuruRMM Get-SmbShare 2026-05-20)
- settings.json: remove hardcoded D:/claudetools UserPromptSubmit hook
  (machine-specific path belongs in settings.local.json only; Howard's
  machine is C:/claudetools)

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

.claude/settings.json

@@ -5,18 +5,5 @@
   "preferences": {
     "autoCompact": true,
     "verbose": false
-  },
-  "hooks": {
-    "UserPromptSubmit": [
-      {
-        "hooks": [
-          {
-            "type": "command",
-            "command": "bash \"D:/claudetools/.claude/scripts/check-messages.sh\"",
-            "timeout": 15
-          }
-        ]
-      }
-    ]
   }
 }