Child of #409 (robust CI/CD epic).

Run Child A's E2E suite (and the product suite) across multiple Workbench container versions to catch version-specific auth/UI regressions.

Scope

• CI matrix over a set of Workbench versions (support window: current + 1–2 back).
• Instantiates the right page objects per version — consumes the versioned page objects from [Feature] Better version gating #410.

Acceptance

• Matrix run executes the E2E/product suite per Workbench version.
• Version-specific selector/behavior differences resolved correctly (no false failures from UI changes across versions).

Depends on

• [Feature] More robust CI/CD #409 Child A (mock-IdP E2E suite).
• [Feature] Better version gating #410 (versioned page objects + robust version parser).

Design: thoughts/shared/plans/2026-06-30-issue-409-robust-cicd-design.md