feat(agent): add generic type parameter to AgentState.getAll()

[NickEckardt]

The get, set, and delete methods all accept a generic for type-safe state access, but getAll() forced callers to use as casts. This adds a generic overload so callers can opt into a narrower return type (e.g. state.getAll()) without a cast, while the unparameterized overload continues to return Record<string, JSONValue>.

No runtime behavior changes.

Description

Adds a generic overload to AgentState.getAll() matching the existing pattern on get, set, and delete. Callers can now write state.getAll<MyState>() instead of state.getAll() as MyState. The extends Record<string, JSONValue> constraint ensures only compatible types can be asserted. The unparameterized getAll() overload continues to return Record<string, JSONValue> — no breaking changes.

Related Issues

None

Documentation PR

None — no new public API surface, just an additional overload on an existing method.

Type of Change

New feature

Testing

How have you tested the change?

• I ran npm run check

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

---

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.