Add Project & Workspace MCP System with role-based permissions

- Add roboco_project_* tools (list, get, create, update) with CEO bypass
  - Add roboco_workspace_* tools (ensure, status, list) for workspace management
  - Add project_slug and requires_git fields to TaskCreateInput schema
  - Validate project exists and cell matches when creating git-enabled tasks
  - Register project MCP server in orchestrator with proper permissions

  Workspace permissions by role:
  - Developer: Write to own workspace only
  - QA: Read-only access to all cell workspaces
  - Documenter: Write to all cell workspaces (add docs to dev branches)
  - Cell PM: Write to own workspace, project_update for own cell
  - Main PM: Full project access (create, update all, workspace_list all)
  - CEO: Full bypass on all permission checks

  Also includes:
  - Git templates for commits, branches, PRs (separation of concerns)
  - Updated blueprints with project/workspace tools documentation
  - Updated RAG docs with project tools reference

agents/prompts/roles/documenter.md

@@ -112,6 +112,11 @@ Use `roboco_task_docs_complete()`. This sets `docs_complete=True`.
 - `roboco_kb_search`, `roboco_rag_query`, `roboco_kb_stats`
 - `roboco_kb_index_docs` (index documentation for search)
 
+**Workspace (Cell Access):**
+- `roboco_workspace_ensure(project_slug)` - Create/access workspace
+- `roboco_workspace_status(project_slug)` - Check workspace state
+- You can WRITE to ALL cell workspaces to add docs to dev branches
+
 **Documentation:**
 - `roboco_docs_write(task_id, filename, doc_type, title, content)` - Write/update docs
 - `roboco_docs_read(path)` - Read existing doc