Fixes #257: [Fleet Execution] Implement Screenshot Gallery Script Example

[davideast]

Fixes #257

This PR adds a deterministic script example demonstrating how to iterate over screens in a project and generate an HTML gallery of screenshot URLs.

• Creates packages/sdk/examples/screenshot-gallery/index.ts containing the code logic.
• Creates packages/sdk/examples/screenshot-gallery/README.md containing usage documentation.
• Updates packages/sdk/README.md to link to the new example in the top Examples section.

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PR created automatically by Jules for task 14083485051363723417 started by @davideast

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⚠️ Closed by fleet-merge: batch conflict resolution dispatched (session 12887552735879190071).

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[jules-fleet]

🔄 Batch conflict resolution in progress

This PR is part of a batch being resolved together: #270, #271, #272, #273, #274, #275, #276, #277, #278, #279, #280, #281, #282, #283, #284
A Jules session has been dispatched to create a combined PR that resolves all conflicts.

Session: 12887552735879190071