chore: add multica.json with run script configuration

[alexgrozav]

Summary

• Adds multica.json to configure run scripts for the Multica platform
• Scripts are nested under a scripts field with setup, run (dev/start), and cleanup entries

Test plan

• Verify multica.json is present at the repo root
• Confirm the JSON structure matches the expected schema

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⚠️ No Changeset found

Latest commit: 2110d17

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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