Import dyad repository as git submodule at third_party/dyad

.gitmodules

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+[submodule "third_party/dyad"]
+	path = third_party/dyad
+	url = https://github.com/dyad-sh/dyad.git

README.md

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-# saas
+# saas
+
+## Submodules
+
+This repository uses git submodules for external dependencies.
+
+### Included Submodules
+
+| Path | Repository | Description |
+|------|------------|-------------|
+| `third_party/dyad` | https://github.com/dyad-sh/dyad.git | Dyad - External dependency |
+
+### Initializing Submodules
+
+After cloning this repository, initialize and update all submodules with:
+
+```bash
+git submodule update --init --recursive
+```
+
+To clone this repository with all submodules in one command:
+
+```bash
+git clone --recurse-submodules <repository-url>
+```
+
+### Updating Submodules
+
+To update submodules to their latest commits:
+
+```bash
+git submodule update --remote --merge
+```
+
+## Third-Party Licenses
+
+This project includes third-party code. See the [THIRD_PARTY_LICENSES.md](THIRD_PARTY_LICENSES.md) file for license information.

THIRD_PARTY_LICENSES.md

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+# Third-Party Licenses
+
+This document lists the licenses of third-party software included in this repository.
+
+## Dyad
+
+- **Path**: `third_party/dyad`
+- **Repository**: https://github.com/dyad-sh/dyad.git
+- **License**: Apache License 2.0 (with additional terms for `src/pro/` directory)
+
+The full license text is available in `third_party/dyad/LICENSE`.
+
+### License Summary
+
+Portions of the dyad software are licensed as follows:
+
+- All content that resides under the `src/pro/` directory of the dyad repository, if that directory exists, is licensed under the license defined in `src/pro/LICENSE`.
+- Content outside of the above-mentioned directories is available under the Apache License 2.0.
+
+For the complete license terms, please refer to the LICENSE file in the dyad submodule.