Changes since langchain-core==0.3.48
core[patch]: release 0.3.49 (#30500)
core[patch]: store model names on usage callback handler (#30487)
core[patch]: mark usage callback handler as beta (#30486)
core[patch]: Remove old accidental commit (#30483)
core[patch]: add token counting callback handler (#30481)
core[patch]: Fix handling of title when tool schema is specified manually via JSONSchema (#30479)
docs[patch]: update trim_messages doc (#30462)