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)
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