docs: add Agent Teams Quick Start Guide (v3.23.2)

Added practical 8-10 min guide for using agent teams in real projects.

Added:
- guide/workflows/agent-teams-quick-start.md (580 lines)
  - 5-minute setup walkthrough
  - 4 copy-paste patterns (Guide + RTK projects)
  - Decision matrix (10+ scenarios)
  - Success metrics framework
  - Red flags section

Updated:
- guide/workflows/agent-teams.md: Link to quick start
- guide/ultimate-guide.md: Section 9.20 with quick start link
- machine-readable/reference.yaml: agent_teams_quick_start entry
- CHANGELOG.md: Release v3.23.2
- VERSION: 3.23.1 → 3.23.2

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

README.md

@@ -499,7 +499,7 @@ See [CONTRIBUTING.md](./CONTRIBUTING.md) for guidelines.
 
 ---
 
-*Version 3.23.1 | February 2026 | Crafted with Claude*
+*Version 3.23.2 | February 2026 | Crafted with Claude*
 
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