fix(honcho): cover pinUserPeer + aiPeer edge cases in setup, clone, and gateway cache

Three related regressions stemming from the pinUserPeer alias landing:

- Setup wizard read host-only fields when detecting current shape but the
  parser supports root-level config and gives host pinUserPeer higher
  precedence than pinPeerName. Re-running setup could mis-detect shape
  and silently flip routing. Detection now uses the same resolver order
  as HonchoClientConfig, and each shape branch scrubs every peer-mapping
  key before writing so a stale pinUserPeer=false can't outrank a freshly
  written pinPeerName=true. Multi no longer auto-writes
  userPeerAliases={} (was silently masking root-level baselines).

- clone_honcho_for_profile inherited pinPeerName but not pinUserPeer, so
  a default profile configured with the newer key produced cloned
  profiles without the pin.

- Gateway cache-busting signature fingerprinted Honcho user-peer fields
  but not ai_peer. Since HonchoSessionManager freezes cfg.ai_peer at
  init, mid-flight aiPeer edits kept assistant writes on the old peer
  until an unrelated cache eviction. ai_peer is now part of the
  signature.

gateway/run.py

@@ -15073,20 +15073,23 @@ class GatewayRunner:
             out["tools.registry_generation"] = None
 
         # Honcho identity-mapping keys live in honcho.json, not user_config.
-        # HonchoSessionManager freezes the resolved peer_name / pin / aliases /
-        # prefix at construction; without busting here, mid-flight honcho.json
-        # edits go unread until the next unrelated cache eviction.
+        # HonchoSessionManager freezes the resolved peer_name / ai_peer /
+        # pin / aliases / prefix at construction; without busting here,
+        # mid-flight honcho.json edits go unread until the next unrelated
+        # cache eviction.
         try:
             from plugins.memory.honcho.client import HonchoClientConfig
 
             hcfg = HonchoClientConfig.from_global_config()
             out["honcho.peer_name"] = hcfg.peer_name
+            out["honcho.ai_peer"] = hcfg.ai_peer
             out["honcho.pin_peer_name"] = bool(hcfg.pin_peer_name)
             out["honcho.runtime_peer_prefix"] = hcfg.runtime_peer_prefix or ""
             aliases = hcfg.user_peer_aliases or {}
             out["honcho.user_peer_aliases"] = sorted(aliases.items()) if isinstance(aliases, dict) else []
         except Exception:
             out["honcho.peer_name"] = None
+            out["honcho.ai_peer"] = None
             out["honcho.pin_peer_name"] = None
             out["honcho.runtime_peer_prefix"] = None
             out["honcho.user_peer_aliases"] = None