Prepare for repo rename: ai -> architecture

Updated all internal references for the rename:
- CLAUDE.md: New purpose statement, updated structure, added manifesto info
- README.md: Updated title, clone URL, folder structure
- commands/retro.md: Changed flowmade-one/ai to flowmade-one/architecture

The actual Gitea rename should be done after merging this PR.

Closes #44

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

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

README.md

@@ -1,4 +1,6 @@
-# Claude Code AI Workflow
+# Architecture
+
+The organizational source of truth: how we work, who we serve, what we believe, and how we build software with AI.
 
 A composable toolkit for enhancing [Claude Code](https://claude.ai/claude-code) with structured workflows, issue management, and AI-assisted development practices.
 
@@ -53,8 +55,8 @@ The project is built around three composable component types:
 
 ```bash
 # Clone the repository
-git clone ssh://git@code.flowmade.one/flowmade-one/ai.git
-cd ai
+git clone ssh://git@code.flowmade.one/flowmade-one/architecture.git
+cd architecture
 
 # Install symlinks to ~/.claude/
 make install
@@ -87,7 +89,9 @@ echo "YOUR_TOKEN" | tea -H code.flowmade.one auth add-key username
 ## Project Structure
 
 ```
-ai/
+architecture/
+├── manifesto.md        # Organization vision, personas, beliefs
+├── learnings/          # Captured learnings and governance
 ├── commands/           # Slash commands invoked by users
 │   ├── work-issue.md
 │   ├── dashboard.md