The present Core frontier is no longer simply asking whether structures can persist. The harder question is whether organized structures can develop internal dependence, specialization, repair, and identity strong enough to survive interaction and change.
Earlier testing established increasingly organized and persistent structures. More recent work has produced evidence for specialization, tradeoff behavior, effective constraint, and bidirectional cross-support. But several stronger forms of mutual necessity and repair have failed.
Core currently has evidence that organized components can become differentiated and can support one another. What has not yet been demonstrated is that those relationships become necessary enough to define a truly stable higher-level identity. That distinction matters: useful cooperation is not the same thing as an irreducible organized whole.
Differentiated functional roles can arise from the same underlying rules rather than being assigned in advance.
Differentiated components can provide bidirectional support, strengthening organization beyond simple coexistence.
The stronger claim that the whole has become impossible to reduce to independently viable components remains unresolved.
Recent tests are especially useful because they distinguish between relationships that are merely helpful and relationships that are structurally necessary.
That is the next major threshold. Core now needs to determine whether differentiated structure can move from beneficial interaction into a regime where the relationships themselves are required for the identity and continued viability of the whole.
Can the structure become dependent on a specific internal organization rather than merely on the presence of its components?
Can maintenance and repair become part of the structure's own organization instead of being externally supplied?
Can the same organized entity remain recognizable while its local components or configuration change?
Can an organized structure interact with its surroundings while preserving the relationships that define it?
Core has not produced a physical particle and does not claim that the current structures correspond to known particles in nature. The frontier is narrower: determine whether the ancestry can legitimately cross from organized persistence into stable, relationally defined identity without inserting that identity by hand.