chore: remove protobufs git submodule

[danditomaso]

Summary

• Removed the packages/packages/protobufs git submodule and cleaned up .gitmodules

Test plan

• Verify build still works without the submodule
• Confirm no remaining references to the protobufs submodule

[vercel]

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[Copilot]

Pull request overview

Removes the repository-level git submodule reference for packages/packages/protobufs, aiming to fully detach protobuf definitions from submodule management.

Changes:

• Removed the packages/packages/protobufs submodule entry (gitlink) from the repo.
• Removed the corresponding submodule configuration from .gitmodules.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/packages/protobufs	Removes the gitlink entry so the submodule is no longer tracked.
.gitmodules	Removes the protobufs submodule configuration from the repo.

Comments suppressed due to low confidence (1)

.gitmodules:1

• After removing the only submodule entry, the repository-level .gitmodules is now an empty tracked file. It should be deleted from the repo entirely to avoid implying submodules still exist and to reduce confusion for tooling that scans for .gitmodules.

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