H-6411: Add some basic user-facing documentation for Petrinaut

[CiaranMn]

🌟 What is the purpose of this PR?

Add some user documentation to the Petrinaut folder, and adds a 'Docs' link to the burger menu that will open that page on GitHub (this link will be broken until PR is merged).

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

The changes in this PR:

• is docs

🕸️ Does this require a change to the Turbo Graph?

The changes in this PR:

• do not affect the execution graph

⚠️ Known issues

BLOCKED ON

1. Adding screenshots (see placeholder markers in docs)
2. Updating docs when we add scenarios + metrics

📹 Demo

See https://github.com/hashintel/hash/blob/9c33aa962287035071bbbaaf84b9a7b8d7099018/libs/%40hashintel/petrinaut/docs

[vercel]

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Project	Deployment	Actions	Updated (UTC)
hash	Ready	Preview, Comment	Apr 15, 2026 9:21pm
petrinaut	Ready	Preview, Comment	Apr 15, 2026 9:21pm

2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
hashdotdesign	Ignored	Preview	Apr 15, 2026 9:21pm
hashdotdesign-tokens	Ignored	Preview	Apr 15, 2026 9:21pm

[kube]

🎉

[alex-e-leon]

Looks great @CiaranMn - wish I had these on day 1 😉

One other thing I would love to eventually see is a "Getting started/build your first net" tutorial, that handholds you through building a simple example net.

Also a note on my review style: Any time I leave a comment with "minor" those are totally optional to action - I use "minor" to share my personal opinion, ask questions, etc, and so feel free to ignore them completely (or not - its up to you)

See the output of git range-diff at https://github.com/hashintel/hash/actions/runs/24399218063

[cursor]

PR Summary

Low Risk
Primarily adds documentation and a new external link; only functional change is removing an unused example/menu entry.

Overview
Adds a new libs/@hashintel/petrinaut/docs user guide (overview + pages for drawing nets, extensions, simulation, visual settings, patterns, and built-in examples) and wires a new Docs item into the editor hamburger menu to open the docs on GitHub.

Removes the old non-stochastic supply-chain example and its "Supply Chain" load-example menu entry, leaving the probabilistic version as the remaining supply-chain example.

^{Reviewed by Cursor Bugbot for commit 695d001. Bugbot is set up for automated code reviews on this repo. Configure here.}

[augmentcode]

🤖 Augment PR Summary

Summary: Adds an initial user-facing documentation set for Petrinaut and exposes it via a new “Docs” menu item in the editor.

Changes:

• Introduced a docs section under libs/@hashintel/petrinaut/docs covering drawing/editing nets, extensions (types/dynamics/kernels), simulation behavior/settings, visual settings, and built-in examples.
• Added a “Docs” entry to the editor hamburger menu that opens the GitHub docs folder in a new tab.
• Removed the older non-stochastic supply-chain example and its “Load example” menu item, leaving the stochastic/probabilistic supply-chain example.

Technical Notes: The Docs link targets the main branch path on GitHub (intended to work once merged), and opens with noopener,noreferrer for safety.

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[augmentcode]

Review completed. 5 suggestions posted.

Comment augment review to trigger a new review at any time.

See the output of git range-diff at https://github.com/hashintel/hash/actions/runs/24476982394

[drdma]

Just 1 question/comment, otherwise LGTM 🙇‍♀️

See the output of git range-diff at https://github.com/hashintel/hash/actions/runs/24478768216