feat: integrate vouch & stricter issue trust management system (#12640)

CONTRIBUTING.md

@@ -258,3 +258,49 @@ These are not strictly enforced, they are just general guidelines:
 ## Feature Requests
 
 For net-new functionality, start with a design conversation. Open an issue describing the problem, your proposed approach (optional), and why it belongs in OpenCode. The core team will help decide whether it should move forward; please wait for that approval instead of opening a feature PR directly.
+
+## Trust & Vouch System
+
+This project uses [vouch](https://github.com/mitchellh/vouch) to manage contributor trust. The vouch list is maintained in [`.github/VOUCHED.td`](.github/VOUCHED.td).
+
+### How it works
+
+- **Vouched users** are explicitly trusted contributors.
+- **Denounced users** are explicitly blocked. Issues and pull requests from denounced users are automatically closed. If you have been denounced, you can request to be unvouched by reaching out to a maintainer on [Discord](https://opencode.ai/discord)
+- **Everyone else** can participate normally — you don't need to be vouched to open issues or PRs.
+
+### For maintainers
+
+Collaborators with write access can manage the vouch list by commenting on any issue:
+
+- `vouch` — vouch for the issue author
+- `vouch @username` — vouch for a specific user
+- `denounce` — denounce the issue author
+- `denounce @username` — denounce a specific user
+- `denounce @username <reason>` — denounce with a reason
+- `unvouch` / `unvouch @username` — remove someone from the list
+
+Changes are committed automatically to `.github/VOUCHED.td`.
+
+### Denouncement policy
+
+Denouncement is reserved for users who repeatedly submit low-quality AI-generated contributions, spam, or otherwise act in bad faith. It is not used for disagreements or honest mistakes.
+
+## Issue Requirements
+
+All issues **must** use one of our issue templates:
+
+- **Bug report** — for reporting bugs (requires a description)
+- **Feature request** — for suggesting enhancements (requires verification checkbox and description)
+- **Question** — for asking questions (requires the question)
+
+Blank issues are not allowed. When a new issue is opened, an automated check verifies that it follows a template and meets our contributing guidelines. If an issue doesn't meet the requirements, you'll receive a comment explaining what needs to be fixed and have **2 hours** to edit the issue. After that, it will be automatically closed.
+
+Issues may be flagged for:
+
+- Not using a template
+- Required fields left empty or filled with placeholder text
+- AI-generated walls of text
+- Missing meaningful content
+
+If you believe your issue was incorrectly flagged, let a maintainer know.