addr: propagate Protocol field in AddrUpdate subscriptions

[cgoncalves]

The IFA_PROTO attribute was parsed in parseAddr but not included in the AddrUpdate struct or its construction in addrSubscribeAt, so address subscription consumers never saw the protocol value.

IFA_PROTO support added in #1157

Summary by CodeRabbit

• New Features
  • Address-change notifications now include the protocol value associated with each address update.
  • Applications can read this new protocol metadata from the update information (e.g., for both address additions and deletions).

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 985ad1e8-ffbd-4e05-85c2-eaa148e03c5f

📥 Commits

Reviewing files that changed from the base of the PR and between 85cdcff and c28d43a.

📒 Files selected for processing (1)

• addr_linux.go

🚧 Files skipped from review as they are similar to previous changes (1)

• addr_linux.go

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📝 Walkthrough

Walkthrough

AddrUpdate now exposes the kernel IFA_PROTO value, and address-change notifications populate this field from the parsed address state.

Changes

Address protocol propagation

Layer / File(s)	Summary
Expose and populate address protocol addr_linux.go	Adds the exported Protocol field to AddrUpdate and sets it for RTM_NEWADDR and RTM_DELADDR notifications.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and accurately describes the main change: propagating Protocol in AddrUpdate subscriptions.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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