docs(first-party): [PATCH 01/08] AFD + WAF + Private Link GLB design …

[rchincha]

…(SFI-NS253)

Part 01 of an 8-patch split of #373. Docs-only patch; no code changes.

Contents:

• docs/first-party/001-afd-global-load-balancing.md — design proposal
• docs/first-party/002-afd-implementation-plan.md — implementation plan
• docs/first-party/003-pre-implementation-checklist.md — SFI-NS253 checklist
• docs/first-party/README.md — first-party proposals index + competitive context
• .github/workflows/markdown.links.config.json — ignore SSO-gated eng.ms links
• .github/.copilot/breadcrumbs/** — design breadcrumbs and ATM baselines

Copilot-Session: a8fabc68-e113-49ef-b82d-d99a8502da11

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Requirements:

• run make reviewable for basic local test
• Read and followed fleet-networking's Code of conduct.
• uses conventional commit messages
• includes documentation
• adds unit tests

How has this code been tested

Special notes for your reviewer

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.90%. Comparing base (5b22264) to head (29ee0e3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #380      +/-   ##
==========================================
- Coverage   67.55%   66.90%   -0.66%     
==========================================
  Files          33       33              
  Lines        4889     3783    -1106     
==========================================
- Hits         3303     2531     -772     
+ Misses       1410     1077     -333     
+ Partials      176      175       -1     

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