feat: implement real shared worker

[ryanbonial]

Description

Implemented cross-iframe query forwarding between Dashboard and SDK apps using SharedWorker. This allows SDK apps running in iframes to execute queries through the parent Dashboard application, enabling centralized query execution and caching.

The implementation uses a combination of:

• Comlink for iframe communication
• SharedWorker for query execution and caching
• Message passing protocol for query requests and responses

What to review

• The communication flow between Dashboard and SDK app iframes
• SharedWorker query execution and caching implementation
• Query forwarding detection in the SDK app
• Error handling and connection management
• Performance implications of the query caching mechanism

Testing

Tested by:

• Running the Dashboard and SDK app locally
• Verifying query forwarding works when SDK app is loaded in an iframe
• Checking that query results are properly cached in the SharedWorker
• Confirming that the same queries reuse cached results

Fun gif

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Project	Deployment	Preview	Comments	Updated (UTC)
sdk-docs	Ready	Preview	Comment	Sep 4, 2025 8:15pm
sdk-kitchensink-react	Ready	Preview	Comment	Sep 4, 2025 8:15pm

[ryanbonial]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat: implement real shared worker #612 👈 (View in Graphite)
• feat(core): implement real SharedWorker query execution #613
• feat(core): add connection to query store #601
• feat: add service worker store and script #600 : 2 other dependent PRs (#615 , #616 )
• feat(apps): scaffold experimentation apps #599
• main

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