docs: Add authority levels and skills vs agents insights to architecture

- Add Authority subheading to each component section with detailed
  execution authority information
- Update hierarchy diagram to show authority levels (Deterministic,
  Highest, High, Low)
- Add "Skills vs Agents: Key Insights" section distilling key
  architectural patterns from research
- Update Quick Reference table with Authority column
- Remove morph-mcp from settings (using native Edit tool)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/settings.local.json

@@ -54,7 +54,9 @@
       "Bash(perplexity:*)",
       "Bash(md5:*)",
       "Bash(test:*)",
-      "Bash(head:*)"
+      "Bash(head:*)",
+      "WebSearch",
+      "WebFetch(domain:www.anthropic.com)"
     ],
     "deny": [],
     "ask": [