chore(roo): establish git branching strategy for workshop monorepo

- Add branch naming convention: type/scope/short-description
- Update gitea-push skill: branch guard in Step 1 (never commit to main)
- Update rules-mcp-builder: create branch before any MCP build
- Update rules-bigmind: create branch before any BigMind task
- Update rules-homelab: create branch before any homelab task
- Add Section 11 to REPO_STRATEGY.md: full branching strategy doc
  (types, scopes, workflow, Lumen responsibilities, examples)
- Ticketing decision: Gitea Issues only, no Docker ticketing service

.roo/rules-mcp-builder/00-mcp-builder-behavior.md

@@ -41,9 +41,14 @@ if __name__ == "__main__":
 ## Before Starting Any MCP Build
 1. **Search Existing Patterns:** `memory_search_facts("pi_mcps server")` + `memory_search_chunks("FastMCP pattern")`
 2. **Check Gitea:** Does a similar server already exist in pi_mcps?
-3. **Write PLAN.md:** Purpose, tools list with signatures, tech stack, v1 scope boundaries
-4. **Announce Focus:** `memory_announce_focus(session_id, "MCP Builder: new server X", files=["mcp/X/src/server.py"], ide_hint="VS Code")`
-5. **Form Hypothesis:** `memory_add_hypothesis(session_id, "Server X will need N tools and Y authentication pattern")`
+3. **Create a branch (MANDATORY — never work on main):**
+   ```bash
+   git checkout -b feat/mcp/{server-name}
+   # or fix/mcp/{server-name} for a bug fix
+   ```
+4. **Write PLAN.md:** Purpose, tools list with signatures, tech stack, v1 scope boundaries
+5. **Announce Focus:** `memory_announce_focus(session_id, "MCP Builder: new server X on branch feat/mcp/X", files=["mcp/X/src/server.py"], ide_hint="VS Code")`
+6. **Form Hypothesis:** `memory_add_hypothesis(session_id, "Server X will need N tools and Y authentication pattern")`
 
 ## Standard Build Sequence
 1. `mcp/{name}/PLAN.md` — purpose, tools, tech stack