[v1][breaking] Tighten EvaluatorResponse interface (typed accessors, time.Duration, drop Get prefix)

[robbyt]

Summary

platform/evaluatorResponse.go:5-21:

type EvaluatorResponse interface {
    Type() data.Types
    Inspect() string
    Interface() any
    GetScriptExeID() string
    GetExecTime() string  // <-- returns Duration.String()
}

Three changes worth making before v1.

1. GetExecTime() string → ExecTime() time.Duration

The duration is held internally as time.Duration and stringified at the boundary:

• engines/extism/evaluator/response.go:80
• engines/risor/evaluator/response.go:60

Stringifying durations at the boundary is anti-idiomatic.

2. Drop the Get prefix from getters per Go style

ScriptExeID(), ExecTime().

3. Consider typed accessors

Every integration test currently does result.Interface().(map[string]any) (~30 occurrences in engines/integration_test.go). Adding helpers like:

AsString() (string, bool)
AsMap()    (map[string]any, bool)
AsBool()   (bool, bool)
AsInt()    (int64, bool)
AsSlice()  ([]any, bool)

would remove a lot of ceremony. Open question: should these return a sentinel error instead of bool? Risor already exposes a typed object via risorObject.Object embedded in execResult, so a Risor path could be exact; the Extism path is any based on JSON.

Files

• platform/evaluatorResponse.go
• engines/extism/evaluator/response.go
• engines/risor/evaluator/response.go
• engines/starlark/evaluator/response.go

This is a breaking-change candidate for v1.