Parity with Python lib

**Is your feature request related to a problem? Please describe.**
It's pretty frustrating that the TS sdk is missing features from the Python SDK.
At the end of the day, I think most developers building AI systems and platforms benefit a lot by using Typescript.
There's already a few issues that are complaining about specific features missing.

**Describe the solution you'd like**
A clear and concise description of what you want to happen.
It would be beneficial to share the roadmap or have a few open issues for each feature so the community can maybe contribute towards this advancement.

**Describe alternatives you've considered**
Using agentcore just via Python - for me personally, less ideal.

**Use Case**
Building robust type safe systems that can easily integrate in full stack ts projects.

**Would you be willing to contribute this feature?**

- [x] Yes, I would like to contribute this feature
- [ ] No, I'm just suggesting the idea

No files, tests, or entry points are named. Start by comparing the TypeScript SDK with the Python SDK and reviewing the existing feature-specific issues mentioned in the request. Done would require a defined parity scope, roadmap, or set of independently actionable feature issues.

Written by the indexing model from the issue text.