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514bf8da72 docs(research): RRC survey of 67 unsolved hard problems and alignment clusters
- 68 problem records (67 unsolved + 1 solved boundary marker)
- 10 alignment clusters spanning number theory, complexity, geometry,
  topology, analysis, logic, physics, and cosmology
- 30×30 crossing matrix of known reductions, shared techniques, and analogies
- RRC shape/axis tags consistent with existing rrc_equation_classification.md
- JSON validated
2026-06-20 19:12:13 -05:00