docs: scrub internal-ref comment from proto

[satyakwok]

Pre-publish prep for crates.io. proto/sentrix.proto line 15 had a private path reference in a comment. Replaced with neutral phrasing.

Test plan

• Repo leak grep clean across Cargo.toml / src / proto / README / CONTRIBUTING

Summary by CodeRabbit

• Documentation
  • Updated internal code documentation to reflect current implementation status.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: f72a335a-c3d1-4c5b-8f12-8848a3248ad3

📥 Commits

Reviewing files that changed from the base of the PR and between 5553e99 and 4549df3.

📒 Files selected for processing (1)

• proto/sentrix.proto

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📝 Walkthrough

Walkthrough

The PR removes an outdated "Reference design doc" note from a comment in proto/sentrix.proto at line 14. The tonic::Status::unimplemented marker remains unchanged. No message definitions, service definitions, or field numbering were altered.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description does not follow the required template structure. It lacks the mandatory sections: Summary, Scope checkboxes, Checks, Linked issue, and Deploy impact sections specified in the template.	Restructure the description to match the template: add a Summary section, fill in Scope checkboxes, add Checks section with forge commands, add Linked issue section, and add Deploy impact section.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main change: removing an internal reference comment from the proto file. It is concise, specific, and clearly summarizes the primary change.
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-internal-ref

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