1.15.0

What's Changed

• fix: Resolve mypy type errors and fix AppStatus bug by @peteski22 in #895
• fix(openai): Handle subscripted generics in Tool type check by @peteski22 in #896
• feat(core): Add AgentCancel exception for control-flow in callbacks by @peteski22 in #894

Full Changelog: 1.14.1...1.15.0