feat: refactor sgclaw around zeroclaw compat runtime

third_party/zeroclaw/NOTICE

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+ZeroClaw
+Copyright 2025 ZeroClaw Labs
+
+This product includes software developed at ZeroClaw Labs (https://github.com/zeroclaw-labs).
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+Official Repository
+===================
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+License
+=======
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+This software is available under a dual-license model:
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+See CLA.md for the contributor license agreement.
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+Contributors
+============
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+
+Third-Party Dependencies
+========================
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+This project uses third-party libraries and components,
+each licensed under their respective terms.
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+See Cargo.lock for a complete dependency list.
+
+Verifiable Intent Specification
+================================
+
+The src/verifiable_intent/ module is a Rust-native reimplementation based on
+the Verifiable Intent open specification and reference implementation:
+
+  Project:  Verifiable Intent (VI)
+  Author:   agent-intent
+  Source:   https://github.com/agent-intent/verifiable-intent
+  License:  Apache License, Version 2.0
+
+This implementation follows the VI specification design (SD-JWT layered
+credentials, constraint model, three-layer chain). No source code was copied
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