priority and fairness interactive simulator (#4361)

* Add Priority and Fairness interactive walkthrough

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Refactor Priority & Fairness walkthrough into tabbed demo

- Replace inline MDX with a tabbed PriorityFairnessWalkthrough component (Overview, Try It, How It Works, SDK Examples)
- Move Interactive Demos sidebar section after glossary; restore activity-retry-simulator to standalone position in Develop
- Remove unicode symbols from simulator buttons

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Update src/components/elements/PriorityFairnessWalkthrough/Overview.js

Co-authored-by: Milecia McG <47196133+flippedcoder@users.noreply.github.com>

* Update src/components/elements/PriorityFairnessWalkthrough/Overview.js

Co-authored-by: Milecia McG <47196133+flippedcoder@users.noreply.github.com>

* Update src/components/elements/PriorityFairnessWalkthrough/Overview.js

Co-authored-by: Milecia McG <47196133+flippedcoder@users.noreply.github.com>

* Update src/components/elements/PriorityFairnessWalkthrough/Overview.js

Co-authored-by: Milecia McG <47196133+flippedcoder@users.noreply.github.com>

* Update src/components/elements/PriorityFairnessWalkthrough/HowItWorks.js

Co-authored-by: Milecia McG <47196133+flippedcoder@users.noreply.github.com>

* Update src/components/elements/PriorityFairnessWalkthrough/HowItWorks.js

Co-authored-by: Milecia McG <47196133+flippedcoder@users.noreply.github.com>

* move demo on sidebar, replace inline sdk examples with focused cards, remove extra CTAs

* cleanup

* use link to, remove unneccessary link, and update button for dark mode

* switch to agnostic and conceptual

* tighten wording

* fix: resolve merge conflicts, move demo to /demos, fix button contrast and code font

Co-authored-by: jsundai <36107423+jsundai@users.noreply.github.com>

* drop old demo exports

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Milecia McG <47196133+flippedcoder@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Author: 4 people

docs/demos/priority-fairness-walkthrough.mdx

@@ -0,0 +1,22 @@
+---
+id: priority-fairness-walkthrough
+title: Task Queue Priority and Fairness - Interactive Walkthrough
+sidebar_label: Priority and Fairness
+slug: /demos/priority-fairness-walkthrough
+hide_table_of_contents: true
+description: Interactively explore how Task Queue Priority and Fairness control dispatch order. Step through scenarios, see which task gets picked next and why, then grab the SDK code.
+toc_max_heading_level: 2
+keywords:
+  - task queue priority
+  - task queue fairness
+  - priority key
+  - fairness key
+  - interactive demo
+tags:
+  - Task Queues
+  - Priority and Fairness
+---
+
+import { PriorityFairnessWalkthrough } from '@site/src/components';
+
+<PriorityFairnessWalkthrough />

sidebars.js

@@ -1998,6 +1998,7 @@ module.exports = {
         'demos/standalone-activities',
         'demos/serverless-workers',
         'demos/activity-retry-simulator',
+        'demos/priority-fairness-walkthrough',
       ],
     },    {
       type: 'category',