refactor: convert mac-optimizer from raw skill to proper plugin

Restructured 92-mac-optimizer from a CLAUDE.md-based skill into a full
Claude Code plugin with .claude-plugin/plugin.json, 6 slash commands
(/mac-doctor, /mac-packages, /mac-environment, /mac-security,
/mac-cleanup, /mac-resources), and auto-trigger SKILL.md.

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

custom-skills/92-mac-optimizer/commands/mac-resources.md

@@ -0,0 +1,29 @@
+---
+allowed-tools: Bash(bash *audit_resources.sh*), Bash(ps *), Bash(kill *), Bash(df *)
+description: Monitor CPU, memory, disk, battery, and identify resource-hungry processes
+---
+
+## Your task
+
+Check system resource usage on this Mac.
+
+### Step 1 — Run the audit
+
+```bash
+bash $CLAUDE_PLUGIN_ROOT/skills/mac-optimizer/scripts/audit_resources.sh
+```
+
+### Step 2 — Report
+
+Parse JSON output and present as a severity-ranked markdown table:
+
+| Severity | Finding | Recommended Action | Details |
+|---|---|---|---|
+
+### Step 3 — Offer actions
+
+If high-resource processes are found, offer to help. But respect the deny-list:
+
+**Never suggest killing**: kernel_task, launchd, WindowServer, loginwindow, mds, mds_stores, opendirectoryd, coreaudiod, SystemUIServer, Finder, Dock
+
+For user processes consuming excessive resources, ask before terminating.