docs(readme): update Architecture tree post-sentrix-proto migration

[satyakwok]

10 of N in the all-READMEs polish sweep. Architecture diagram still showed proto/sentrix.proto → build.rs / tonic-build → src/grpc/pb but PR #32 dropped local proto + build.rs and migrated to the published sentrix-proto crate from crates.io. Updated diagram + added the wasm-specific default-features = false note.

Summary by CodeRabbit

• Documentation
  • Updated README architecture diagrams and documentation to accurately reflect the current system structure and design. The documentation now clearly illustrates how system components are organized and integrated throughout the codebase, providing improved visibility into the overall application architecture, component relationships and interdependencies, and system design patterns used in the project.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: 27bee52a-e8ba-4ce7-965d-071ad1ab4ce4

📥 Commits

Reviewing files that changed from the base of the PR and between 3165b61 and 1b1423d.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The PR updates the README architecture diagram to reflect a change in how protocol buffer definitions are sourced. Proto definitions now come from an external sentrix-proto crate as the single source of truth (configured with default-features = false for WebAssembly support), replacing the previous local code generation pipeline. The src/grpc/pb module consumes prost types and tonic client stubs directly from this external crate, and src/grpc/mod.rs re-exports these as pb.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• Sentriscloud/sentrix-explorer-v2#32: Implements the migration to consume proto definitions from the sentrix-proto external crate, which this PR documents in the README architecture diagram.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is missing the required Template sections (Summary and Test plan). While it provides context about the change, it does not follow the specified repository template structure.	Restructure the description to match the template: add a clear Summary section (1-3 sentences) and include a Test plan section with a checklist of verification steps.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: updating the Architecture documentation in the README after the sentrix-proto migration, which aligns with the changeset.
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/polish-readme-truth

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