The gateway agent cache read honcho.json itself through a honcho-named
block in gateway/run.py and gateway/run_agent_cache.py. Every other memory
provider had no way to bust the cache when its identity mapping changed.
HonchoMemoryProvider.identity_signature() now returns the same values under
provider-neutral keys: user_identity, agent_identity, pin_user_identity,
runtime_identity_prefix, user_identity_aliases, session_prefixing. The
gateway files them under memory.<key> through the MemoryProvider hook. The
hook reads config only, memoizes on the file's mtime and size, and returns
an empty dict when the file cannot be read.
The honcho-specific extractor, its memo and its key tuple are gone from the
gateway. The pinPeerName cache-busting test now asserts on
memory.pin_user_identity.
88fc9402d8