Add architecture beliefs to manifesto and enhance software-architecture skill

- Add Architecture Beliefs section to manifesto with outcome-focused beliefs:
  auditability, business language in code, independent evolution, explicit over implicit
- Create software-architecture.md as human-readable documentation
- Enhance software-architecture skill with beliefs→patterns mapping (DDD, Event
  Sourcing, event-driven communication) and auto-trigger description
- Update work-issue command to reference skill and check project architecture
- Update issue-worker agent with software-architecture skill
- Add Architecture section template to vision-management skill

The skill is now auto-triggered when implementing, reviewing, or planning
architectural work. Project-level architecture choices go in vision.md.

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

skills/vision-management/SKILL.md

@@ -123,6 +123,17 @@ These extend the organization's guiding principles:
 These extend the organization's non-goals:
 
 - **[Non-goal].** [Explanation]
+
+## Architecture
+
+This project follows organization architecture patterns (see software-architecture skill).
+
+### Alignment
+- [Which patterns we use and where]
+
+### Intentional Divergences
+| Area | Standard Pattern | What We Do Instead | Why |
+|------|------------------|-------------------|-----|
 ```
 
 ### When to Update Vision