docs: Cherry-pick HSTU tutorial and README copyrights to r26.07 (#159, #162)

[yinggeh]

No description provided.

[greptile-apps]

Greptile Summary

This PR cherry-picks two documentation changes from the main branch to r26.07: a new HSTU Generative Recommenders pointer page (Popular_Models_Guide/HSTU/README.md) and a copyright header addition plus a new "Generative Recommenders" table section in the root README.md.

• HSTU README (Popular_Models_Guide/HSTU/README.md): New file with a BSD-3-Clause copyright header and a concise overview of HSTU, linking out to the external recsys-examples repository for training, export, and end-to-end examples.
• Root README (README.md): Prepends a BSD-3-Clause copyright header and adds a "Generative Recommenders" section with one HSTU entry pointing to the new sub-README.

Confidence Score: 5/5

Documentation-only cherry-pick with no code changes; safe to merge.

Both changed files are Markdown documentation. The HSTU README is a new pointer page with no executable code, and the root README change adds a copyright header and one table row. All external links reference known NVIDIA repositories. No logic, data, or configuration is affected.

No files require special attention.

Important Files Changed

Filename	Overview
Popular_Models_Guide/HSTU/README.md	New pointer page for HSTU Generative Recommenders tutorial; adds BSD-3-Clause copyright header and links out to the recsys-examples repo
README.md	Adds BSD-3-Clause copyright header and a new Generative Recommenders section with an HSTU table entry pointing to the new sub-README

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["README.md\n(root)"] -->|"Generative Recommenders section"| B["Popular_Models_Guide/HSTU/README.md"]
    B -->|"HSTU overview link"| C["recsys-examples/examples/hstu/README.md\n(external)"]
    B -->|"HSTU inference link"| D["recsys-examples/.../inference/README.md\n(external)"]
    B -->|"PyTorch AOTI on Triton link"| E["triton pytorch_backend#aot-inductor-support\n(external)"]
    A -->|"HSTU model link"| F["recsys-examples/tree/main/examples/hstu\n(external)"]

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_{Reviews (6): Last reviewed commit: "chore: Fix README copyrights (#162)" | Re-trigger Greptile}