feat(templates): add intelligent preset templates for common workflows

- feature-dev.json: Feature development team (Architect + 2 Engineers + Reviewer + Tester)
- bug-fix.json: Bug fix squad (Investigator + Engineer + Tester)
- code-review.json: Code review team (2 Reviewers)
- greenfield.json: Greenfield project team (full squad)
- release.json: Release team (Shipper + Reviewer)
- investigation.json: Investigation team (Investigator + Engineer)
- refactor.json: Refactoring team (Architect + 2 Engineers + Reviewer)
- full-squad.json: Full development squad
- research-and-discovery.json: Research and discovery team
- Update standard-app.json with enhanced configuration

Each template defines team composition with archetype counts

.beads/templates/greenfield.json

@@ -0,0 +1,17 @@
+{
+  "id": "greenfield",
+  "name": "Greenfield Project",
+  "description": "Full team for starting new projects from scratch. Architect designs foundation, Engineers build core, Tester ensures quality, Shipper sets up deployment.",
+  "team": [
+    { "archetypeId": "architect", "count": 1 },
+    { "archetypeId": "engineer", "count": 3 },
+    { "archetypeId": "tester", "count": 1 },
+    { "archetypeId": "shipper", "count": 1 }
+  ],
+  "protoFormula": "Architect creates design and task breakdown → Engineers implement in parallel → Tester validates each component → Shipper prepares deployment pipeline",
+  "color": "#10b981",
+  "icon": "🌱",
+  "createdAt": "2026-02-25T00:00:00.000Z",
+  "updatedAt": "2026-02-25T00:00:00.000Z",
+  "isBuiltIn": true
+}