chore(ai): remove dead code (agent)

Co-authored-by: PR0M3TH3AN <[email protected]>

docs/auth-architecture.md

@@ -135,4 +135,3 @@ attempting privileged calls.
 
 - [`docs/nostr-auth.md`](nostr-auth.md)
 - [`docs/nip46-remote-signers.md`](nip46-remote-signers.md)
-- [`docs/signing-adapter.md`](signing-adapter.md)

docs/nostr-event-schemas.md

@@ -85,9 +85,6 @@ sign/encrypt calls. Call `clearActiveSigner()` on logout if your integration
 manages session state manually; the built-in logout handler already does this
 for the default extension flow.
 
-For adapter implementation details and test guidance, see
-[`docs/signing-adapter.md`](signing-adapter.md).
-
 ### Accessing raw events
 
 `NostrClient` now keeps a lightweight cache of parsed videos alongside a