chore: scrub internal-file ref from proto comment

[satyakwok]

packages/chain/proto/sentrix.proto carried the same leaky comment that was already scrubbed upstream in sentrix-labs/sentrix and in sdk-ts/src/grpc-web/*. This brings it in line.

Summary by CodeRabbit

• Chores
  • Updated internal documentation reference in protocol definition file. No functional changes or user-facing impact.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

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Run ID: 5f4c060c-2369-4e9f-ae50-52082bebe996

📥 Commits

Reviewing files that changed from the base of the PR and between 3248229 and 43174ff.

📒 Files selected for processing (1)

• packages/chain/proto/sentrix.proto

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📝 Walkthrough

Walkthrough

This PR updates a single comment line in packages/chain/proto/sentrix.proto. The top-of-file comment is replaced with a new inline reference to the internal gRPC service-proto draft. No protobuf message definitions, service declarations, or field numbers are altered. This is a documentation-only change.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description explains what was changed and why, but is missing the required Template sections (Test plan and Related links), making it incomplete against the repository template.	Add the Test plan section with a checklist of test cases and the Related section with relevant issue/PR links or documentation.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: removing an internal file reference from a proto comment, which matches the changeset and commit intent.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/scrub-proto-comment

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