docs: add HSTU (Generative Recommenders) tutorial page (#159)

[yinggeh]

No description provided.

[greptile-apps]

Greptile Summary

This PR adds a new HSTU (Generative Recommenders) tutorial page under Popular_Models_Guide/HSTU/README.md and registers it in the root README.md under a new "Generative Recommenders" section. The HSTU page is intentionally a pointer document that directs Triton users to the external recsys-examples repository for training, export, and end-to-end examples, and to the PyTorch backend docs for the torch_aoti serving path.

• New pointer page (Popular_Models_Guide/HSTU/README.md): concise overview of HSTU with a three-row resource table linking to architecture docs, inference docs, and the Torch AOTI backend guide.
• Root README update: adds a copyright header (previously absent) and inserts a "Generative Recommenders" section with an HSTU entry in the same style as the existing LLM Tutorials table.

Confidence Score: 4/5

Documentation-only change with no executable code; safe to merge after addressing the minor copyright format inconsistency.

Both changed files are Markdown documentation. The only notable inconsistency is the copyright notice in the new HSTU README omitting the "(c)" symbol used everywhere else in the repo. All external links point to plausible, well-known NVIDIA/Triton repositories. The new "Generative Recommenders" section in the root README is correctly structured and does not break any existing content.

Popular_Models_Guide/HSTU/README.md — minor copyright format inconsistency worth correcting before merge.

Important Files Changed

Filename	Overview
Popular_Models_Guide/HSTU/README.md	New HSTU tutorial page that acts as a pointer to the external recsys-examples repository; copyright header omits the "(c)" symbol present in other repo files
README.md	Adds a copyright header to the root README and a new "Generative Recommenders" section with the HSTU entry; structure and links look correct

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["README.md root"] -->|LLM Tutorials| B["Popular_Models_Guide Llama2 Llava1.5 etc"]
    A -->|Generative Recommenders new| C["Popular_Models_Guide/HSTU/README.md new pointer page"]
    C -->|HSTU overview| D["recsys-examples hstu/README.md"]
    C -->|HSTU inference| E["recsys-examples hstu/inference/README.md"]
    C -->|PyTorch AOTI on Triton| F["pytorch_backend aot-inductor-support-beta"]

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[greptile-apps]

The copyright notice here is missing the (c) symbol and covers only 2026, whereas the root README.md added in the same PR uses Copyright (c) 2023-2026. Other files in the repo consistently include (c). Consider aligning the format.

Suggested change

	# Copyright 2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
	# Copyright (c) 2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

[mc-nv]

Correct it's a legal requirement.

[yinggeh]

Superseded by #164 (combined cherry-pick directly off r26.07).