The passkey login/assertion HTTP handler stays deferred after its design
checkpoint; capture the reasoning in the handler header so the decision is
durable in the repo rather than only in task notes.
- RP boundary (resolved): felis-api is the app-login relying party (panel.*);
the WebAuthn security gate lives at the Cloudflare Access edge. Spec §14 ties
WebAuthn/posture to admin.* (Access) while panel.* is plain app login, so
there is neither a spec-required assertion handler nor a backend step-up
consumer for one.
- Identifier (blocking): a from-zero login needs a unique, human-typable handle
to resolve an account, but users.email is nullable and non-unique and a
player's username is their Minecraft uuid. Username-first assertion has
nothing to key on; re-link stays the returning-player door.
Discoverable (usernameless) credentials are the future enabler; the adapter
crypto is already verified so that slice inherits correct crypto.
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