feat(template): add complete OpenCode project template with placeholder paths

- Replace hardcoded project paths with generic placeholders ([NOME_PROGETTO], [ROOT_PROGETTO])
- Add .opencode/ configuration with agent definitions (spec-architect, tdd-developer, git-manager, security-reviewer)
- Add export/ templates (prd, architecture, kanban, progress, githistory)
- Add docs/ templates (bug_ledger, architecture)
- Add prompt/prompt-zero.md kickoff template
- Update README.md with installation instructions and usage guide

Template now ready for reuse in new projects with workflow:
  1. Spec-Driven (@spec-architect)
  2. TDD (@tdd-developer)
  3. Git management (@git-manager)

.opencode/opencode.json

@@ -0,0 +1,29 @@
+{
+  "$schema": "https://opencode.ai/config.json",
+  "mcp": {
+    "sequential-thinking": {
+      "type": "local",
+      "command": [
+        "npx",
+        "-y",
+        "@modelcontextprotocol/server-sequential-thinking"
+      ]
+    },
+    "context7": {
+      "type": "local",
+      "command": [
+        "npx",
+        "-y",
+        "@context7/mcp-server"
+      ]
+    },
+    "universal-skills": {
+      "type": "local",
+      "command": [
+        "npx",
+        "-y",
+        "github:jacob-bd/universal-skills-manager"
+      ]
+    }
+  }
+}