feat: refactor sgclaw around zeroclaw compat runtime

third_party/zeroclaw/docs/contributing/README.md

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+# Contributing, Review, and CI Docs
+
+For contributors, reviewers, and maintainers.
+
+## Core Policies
+
+- Contribution guide: [../../CONTRIBUTING.md](../../CONTRIBUTING.md)
+- PR workflow rules: [./pr-workflow.md](./pr-workflow.md)
+- Reviewer playbook: [./reviewer-playbook.md](./reviewer-playbook.md)
+- CI map and ownership: [./ci-map.md](./ci-map.md)
+- Actions source policy: [./actions-source-policy.md](./actions-source-policy.md)
+- Extension examples: [./extension-examples.md](./extension-examples.md)
+- Testing guide: [./testing.md](./testing.md)
+
+## Suggested Reading Order
+
+1. `CONTRIBUTING.md`
+2. `pr-workflow.md`
+3. `reviewer-playbook.md`
+4. `ci-map.md`