I-17a: v2 provider parity — Auth (7 pending items)

[ElioNeto]

Description

Implement authentication for v2 providers. Parent issue: #27

Pending Items (0/7)

• Auth provider A
• Auth provider B
• Auth provider C
• Auth provider D
• Auth provider E
• Auth provider F
• Auth provider G

Parent Issue Checklist

• I-17: v2 provider parity (39/53 — 74%) → I-17: v2 provider parity — 17 items not ported #27

[ElioNeto]

Skipping — large feature requiring systematic auth parity implementation across 7 provider auth items. Needs manual triage.

[ElioNeto]

Skipping — requires manual triage. Unable to resolve automatically due to complexity, platform/API constraints, or insufficient information.