chore: migrate submodule from protos to s2-specs

[cristi-]

Summary

• Rename submodule from protos to s2-specs
• Update submodule URL to s2-specs repository
• Update update_protos script to use new submodule path

Test plan

• Verify submodule points to s2-specs
• Verify ./update_protos script works with new path

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

Renames the submodule from protos to s2-specs to align with the new repository naming convention, and adds automated sync workflow.

• Renamed git submodule from protos to s2-specs and updated URL to point to new repository
• Updated update_protos script to reference new submodule path
• Added sync_specs.yaml workflow to automatically sync submodule updates via repository dispatch events and create PRs with signed commits

Confidence Score: 4/5

• This PR is safe to merge with minimal risk
• The changes are straightforward refactoring (renaming submodule) and adding automation. All references were correctly updated. Minor deduction for new workflow that should be tested in practice to ensure proper operation
• Pay close attention to .github/workflows/sync_specs.yaml to verify it triggers correctly on s2-specs-update events

Important Files Changed

Filename	Overview
.gitmodules	Renamed submodule from protos to s2-specs with updated repository URL
update_protos	Updated script to reference new s2-specs submodule path instead of protos
.github/workflows/sync_specs.yaml	New workflow to auto-sync submodule updates and create PRs with signed commits

Sequence Diagram

sequenceDiagram
    participant S2Specs as s2-specs repo
    participant Dispatch as Repository Dispatch
    participant Workflow as sync_specs.yaml
    participant Submodule as s2-specs submodule
    participant Script as update_protos
    participant PR as Pull Request

    S2Specs->>Dispatch: Trigger s2-specs-update event
    Dispatch->>Workflow: Start workflow
    Workflow->>Workflow: Checkout with submodules
    Workflow->>Submodule: Update s2-specs submodule
    alt Submodule was updated
        Workflow->>Workflow: Setup uv
        Workflow->>Script: Run ./update_protos
        Script->>Script: Regenerate proto files
        Workflow->>PR: Create signed commit PR
        PR->>PR: PR created with s2-helper[bot]
    else No submodule changes
        Workflow->>Workflow: Skip remaining steps
    end

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