test: stabilize renderer and locale governance

[ericsocrat]

Purpose

Repair two base-owned test-governance defects without changing production behavior:

• renderer source-equivalence mutation fixtures stopped modeling runtime drift after the authoritative hosted-runner version caught up with their hard-coded value;
• the Batch 3 locale journey tried to mutate Accept-Language inside one live browser context instead of using locale-specific guarded contexts.

Changes

• derive a guaranteed-distinct test-only runner version from the current authoritative manifest;
• keep the intentional-redesign mutation wrapper bounded at 60 seconds across heterogeneous hosts;
• retain authenticated Polish/German preference assertions in the main journey;
• verify public Polish Learn and German Terms in separate Playwright contexts with explicit locales and overflow screenshots.

Verification

• renderer mutation suite: 14/14 passed;
• visual-safety workflow contracts: 65/65 passed;
• guarded local-authenticated Batch 3 journey: 4/4 passed, including PL/DE contexts;
• type-check, lint and production build: passed;
• repository hygiene, strict doc counts and migration ordering: passed;
• local QA fixtures were loopback-only and torn down; no hosted data was touched.

Scope

Test/governance only. No production source, Auth/provider configuration, database/RLS/data, dependency, baseline, renderer manifest, Lighthouse measurement, or performance-policy change.

The separate production Turnstile first-use/replay proof remains blocked because invite-only production correctly renders no signup widget; this PR does not weaken that admission boundary.

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Project	Deployment	Actions	Updated (UTC)
tryvit	Ready	Preview	Aug 28, 2026 1:36pm