Identity is being replaced in SubZeroDev.Adventures, and that build is the evidence

[The-Running-Dev]

Identity is being replaced in SubZeroDev.Adventures, and that build is the evidence. The
extraction guard wants a running implementation to read rather than a vendor comparison, and
Adventures already runs guest-first cookie identity, a GitHub upgrade path with player merge, and
transfer codes. The replacement is specified in that repository and stays there; the Platform
interest is that it be readable as a contract later — a named principal-resolution seam,
provider-specific code behind one adapter, and ownership enforced at a store decorator rather
than per route. No SubZeroDev.Platform.Identity package is created on the strength of it.

Done when

• The question is answered and the answer recorded

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Agent instructions

Authority: this issue — the bullet that raised it has been removed from design/90-decisions.md's ## Open section, since it is now tracked here rather than there.

Stop if answering this turns out to need a contract or schema change to design/20-contract.md or an existing published contract — that is a design-cycle decision, not one this issue's own scope covers.