refactor: reorganize skill numbering, remove obsolete skills, rename shared libs

- Rename: 00→80 claude-settings-optimizer, 88→79 dintel-skill-update,
  92→81 mac-optimizer, 93→82 tui-design-template
- Rename: dintel-shared → _dintel-shared (consistent with _ourdigital-shared)
- Remove: 61-gtm-manager, 62-gtm-guardian (obsolete), 99_archive
- Update all dintel-* skill refs (114 occurrences across 31 files)
- Sync README.md, CLAUDE.md, AGENTS.md with new structure

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

custom-skills/81-mac-optimizer/.claude-plugin/plugin.json

@@ -0,0 +1,45 @@
+{
+  "name": "mac-optimizer",
+  "version": "1.0.0",
+  "description": "Modular macOS system health toolkit with read-only audits, cleanup, and security checks",
+  "author": {
+    "name": "OurDigital"
+  },
+  "keywords": [
+    "macos",
+    "system",
+    "optimization",
+    "cleanup",
+    "security",
+    "homebrew",
+    "packages",
+    "disk-space"
+  ],
+  "license": "MIT",
+  "commands": [
+    {
+      "name": "mac-doctor",
+      "description": "Full macOS system health check — runs all 5 audit modules and presents unified findings"
+    },
+    {
+      "name": "mac-packages",
+      "description": "Audit package managers (Homebrew, npm, pip, pyenv) for outdated packages and issues"
+    },
+    {
+      "name": "mac-environment",
+      "description": "Audit shell environment — PATH, symlinks, shell configs, and startup time"
+    },
+    {
+      "name": "mac-security",
+      "description": "Security posture assessment — SIP, Gatekeeper, Firewall, FileVault, SSH, ports"
+    },
+    {
+      "name": "mac-cleanup",
+      "description": "Scan and clean caches, logs, and clutter — shows sizes first, cleans only with consent"
+    },
+    {
+      "name": "mac-resources",
+      "description": "Monitor CPU, memory, disk, battery, and identify resource-hungry processes"
+    }
+  ]
+}