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/commands/mac-cleanup.md

@@ -0,0 +1,53 @@
+---
+allowed-tools: Bash(bash *audit_cleanup.sh*), Bash(bash *cleanup_execute.sh*), Bash(du *), Bash(brew *), Bash(npm *), Bash(pip *), Bash(docker *), Bash(rm *)
+description: Scan and clean caches, logs, and clutter — shows sizes first, cleans only with consent
+---
+
+## Your task
+
+Scan for reclaimable disk space and offer cleanup.
+
+### Step 1 — Run the audit
+
+```bash
+bash $CLAUDE_PLUGIN_ROOT/skills/mac-optimizer/scripts/audit_cleanup.sh
+```
+
+### Step 2 — Report
+
+Parse JSON output and present as a table sorted by size (largest first):
+
+| Category | Size | Risk | Target |
+|---|---|---|---|
+
+Show the total reclaimable space.
+
+### Step 3 — Ask for consent
+
+Ask which categories to clean. Group by risk level (Safe / Moderate / Risky).
+
+### Step 4 — Dry run first
+
+For approved targets, always run dry-run first:
+
+```bash
+bash $CLAUDE_PLUGIN_ROOT/skills/mac-optimizer/scripts/cleanup_execute.sh --dry-run <targets>
+```
+
+Show the output and ask for final confirmation.
+
+### Step 5 — Execute
+
+Only after explicit confirmation:
+
+```bash
+bash $CLAUDE_PLUGIN_ROOT/skills/mac-optimizer/scripts/cleanup_execute.sh --execute <targets>
+```
+
+### Safety rules
+
+- Never execute cleanup without explicit user approval
+- Always show sizes before deleting anything
+- Always run --dry-run before --execute
+- Docker cleanup uses `docker system prune`, never direct file deletion
+- No sudo by default — if an action needs sudo, state why and ask first