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/80-claude-settings-optimizer/desktop/skill.yaml

@@ -0,0 +1,39 @@
+# OurDigital Settings Audit
+# Comprehensive error diagnosis and context optimization
+
+name: our-settings-audit
+
+description: |
+  Diagnose all Claude Desktop errors and optimize context usage.
+  Covers 8 error categories: context limits, output interruption,
+  length/file errors, usage limits, server capacity, MCP connection,
+  account issues, and output quality problems.
+
+allowed-tools:
+  - Read
+  - Glob
+  - Grep
+
+license: Internal-use Only
+
+triggers:
+  - settings audit
+  - settings check
+  - audit settings
+  - exceed response limit
+  - response could not be generated
+  - length limit
+  - file too large
+  - conversation limit
+  - 5-hour limit
+  - messages left
+  - rate limit
+  - capacity constraints
+  - server error
+  - MCP error
+  - server connection failed
+  - account disabled
+  - login error
+  - output cutoff
+  - token error
+  - gibberish output