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>

guide/workflows/agent-teams.md

@@ -9,6 +9,8 @@
 **Reading time**: ~30 min
 **Prerequisites**: Opus 4.6 model, understanding of [Sub-Agents](../ultimate-guide.md#sub-agents), familiarity with [Task Tool](../ultimate-guide.md#task-tool)
 
+**🚀 Want to get started fast?** See **[Agent Teams Quick Start Guide](./agent-teams-quick-start.md)** (8-10 min, copy-paste patterns for your projects)
+
 ---
 
 ## Table of Contents