docs: add Profile-Based Module Assembly pattern (Section 3.5)

- Section 3.5 "Team Configuration at Scale" in ultimate-guide.md:
  profiles YAML + shared modules + skeleton + assembler script;
  59% context token reduction measured on 5-dev production team;
  includes CI drift detection, 5-step replication guide, trade-offs
- New workflow: guide/workflows/team-ai-instructions.md (6 phases,
  scaling thresholds, troubleshooting table)
- New templates: examples/team-config/ (profile-template.yaml,
  claude-skeleton.md, sync-script.ts)
- reference.yaml: 9 new entries for team_ai_instructions_*
- README: templates count 161 → 164, date Feb 19 → Feb 20
- CHANGELOG [Unreleased]: resource evaluations (AGENTS.md ETH Zürich
  4/5, Sylvain Chabaud 3/5), spec-first Task Granularity section,
  methodologies ATDD expansion

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

guide/workflows/README.md

@@ -65,6 +65,12 @@ Use existing battle-tested repositories as scaffolding for new projects.
 
 **When to use**: Starting new projects, standardizing team patterns, rapid prototyping from proven foundations
 
+### [Team AI Instructions](./team-ai-instructions.md)
+
+Scale CLAUDE.md across a multi-developer, multi-tool team with profile-based module assembly.
+
+**When to use**: Team 5+ devs, multiple AI tools (Claude Code + Cursor/Windsurf), mixed OS
+
 ---
 
 ## 🎨 Design & Content
@@ -112,6 +118,7 @@ Systematically explore and understand unfamiliar codebases.
 | **UI implementation** | [Design to Code](./design-to-code.md) |
 | **Code quality** | [Iterative Refinement](./iterative-refinement.md) |
 | **New project from template** | [Skeleton Projects](./skeleton-projects.md) |
+| **Team AI instructions** | [Team AI Instructions](./team-ai-instructions.md) |
 | **Documentation** | [PDF Generation](./pdf-generation.md) |
 | **Audio feedback** | [TTS Setup](./tts-setup.md) |
 
@@ -132,4 +139,4 @@ New workflow ideas? Open an issue or PR in the main repository.
 
 ---
 
-**Last updated**: January 2026
+**Last updated**: February 2026