[squad:plan] Lattice Hollow — QA & Test Planning: "Echo Probe" (Hockney)

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Owner: Hockney — Test Engineer

Part of the Lattice Hollow plan (#58481).

Goals:

• Define how puzzle logic, progression, and usability will be tested before demo release.
• Deliverables: test matrix, smoke suite, regression checklist, exploratory scenarios for deadlocks/softlocks.
• Focus on interaction edge cases in light-routing systems and room-state persistence.
• Success criteria for onboarding clarity and puzzle readability.

Depends on milestone readiness from #58475 through #58479.
Related to #58481

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