docs(marketplace): documentation cleanup, version alignment, architecture doc

- Delete orphan files (.doc-guardian-queue, stale backup, switch-profile.sh)
- Delete stale doc folders (architecture/, designs/, prompts/)
- Create consolidated docs/ARCHITECTURE.md for v9.1.0
- Bump all 12 original plugin versions to 9.0.1
- Fix project-hygiene descriptions (no longer a hook)
- Normalize /rfc, /project, /adr command rows in all docs
- Update CANONICAL-PATHS.md, UPDATING.md, README.md, CLAUDE.md
- COMMANDS-CHEATSHEET.md expanded to one row per sub-command

Version: 9.1.0

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

docs/UPDATING.md

@@ -38,7 +38,7 @@ cd ~/.claude/plugins/marketplaces/leo-claude-mktplace && ./scripts/setup.sh
 
 ## What the Post-Update Script Does
 
-1. **Updates Python dependencies** for MCP servers (gitea, netbox)
+1. **Updates Python dependencies** for all 5 MCP servers (gitea, netbox, data-platform, viz-platform, contract-validator)
 2. **Shows recent changelog entries** so you know what changed
 3. **Validates your configuration** is still compatible
 
@@ -157,10 +157,11 @@ cd ~/.claude/plugins/marketplaces/leo-claude-mktplace && ./scripts/setup.sh
 If that doesn't work:
 
 1. Check Python version: `python3 --version` (requires 3.10+)
-2. Verify venv exists in INSTALLED location:
+2. Verify venvs exist in INSTALLED location:
    ```bash
-   ls ~/.claude/plugins/marketplaces/leo-claude-mktplace/mcp-servers/gitea/.venv
-   ls ~/.claude/plugins/marketplaces/leo-claude-mktplace/mcp-servers/netbox/.venv
+   for server in gitea netbox data-platform viz-platform contract-validator; do
+     ls ~/.claude/plugins/marketplaces/leo-claude-mktplace/mcp-servers/$server/.venv && echo "$server: OK" || echo "$server: MISSING"
+   done
    ```
 3. If missing, run setup.sh as shown above.
 4. Restart Claude Code session