chore: Introduce Eval trait.

[He-Pin]

Motivation:
Introduce Eval trait, make Lazy trait entends Eval.

[Copilot]

Pull request overview

This PR introduces a new Eval abstraction to unify strict and lazy evaluation plumbing across the sjsonnet interpreter/runtime, updating stdlib and core evaluator code to use .value instead of .force and broadening APIs from Lazy to Eval.

Changes:

• Add Eval (plus CoEval) and refactor Lazy/Val to implement Eval via .value.
• Update builtin/std-lib function signatures and internal evaluation sites from Lazy/.force to Eval/.value.
• Rename Val.Str’s underlying string field (value → str) and propagate updates throughout parser/optimizer/evaluator/materializer/stdlib.

Reviewed changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
sjsonnet/test/src/sjsonnet/CustomValTests.scala	Updates custom builtin test to accept Eval and use .value.
sjsonnet/test/src-jvm-native/sjsonnet/BaseFileTests.scala	Updates test native function signature and materialization to use Eval.
sjsonnet/test/src-js/sjsonnet/BaseFileTests.scala	Updates JS tests/stubs to use Eval and .value.
sjsonnet/src/sjsonnet/stdlib/TypeModule.scala	Refactors type predicates/assertEqual/equals helpers to Eval + .value.
sjsonnet/src/sjsonnet/stdlib/StringModule.scala	Refactors string stdlib to Eval, updates format specialization and array element types.
sjsonnet/src/sjsonnet/stdlib/StdLibModule.scala	Refactors native, trace, and extVar plumbing to use Eval.
sjsonnet/src/sjsonnet/stdlib/SetModule.scala	Refactors set operations to Eval, including internal array element types and key extraction.
sjsonnet/src/sjsonnet/stdlib/ObjectModule.scala	Refactors object helpers and prune/mergePatch paths to Eval.
sjsonnet/src/sjsonnet/stdlib/NativeRegex.scala	Refactors regex builtins to accept Eval arguments.
sjsonnet/src/sjsonnet/stdlib/MathModule.scala	Refactors mod builtin to Eval and .value.
sjsonnet/src/sjsonnet/stdlib/ManifestModule.scala	Refactors manifest/parse/deepJoin/lines/toml logic to Eval.
sjsonnet/src/sjsonnet/stdlib/EncodingModule.scala	Refactors md5 builtin to accept Eval.
sjsonnet/src/sjsonnet/stdlib/ArrayModule.scala	Refactors array stdlib functions to Eval, updating internal builders/queues/arrays.
sjsonnet/src/sjsonnet/functions/FunctionBuilder.scala	Refactors typed builtin wrappers to read args from .value.
sjsonnet/src/sjsonnet/ValVisitor.scala	Updates JSON-to-Val visitor to build arrays of Eval.
sjsonnet/src/sjsonnet/ValScope.scala	Changes scope bindings storage from Array[Lazy] to Array[Eval].
sjsonnet/src/sjsonnet/Val.scala	Introduces Eval/CoEval, migrates LazyWithComputeFunc + Val to .value, updates Val.Str field name and Val.Arr element type.
sjsonnet/src/sjsonnet/StaticOptimizer.scala	Updates string-constant optimizations to use Val.Str.str.
sjsonnet/src/sjsonnet/Parser.scala	Updates parser internals for Eval arrays and Val.Str.str.
sjsonnet/src/sjsonnet/Materializer.scala	Updates reverse-materialization array element type to Eval.
sjsonnet/src/sjsonnet/Format.scala	Refactors format handling to Eval and .value.
sjsonnet/src/sjsonnet/Evaluator.scala	Refactors evaluator to store/propagate Eval in scopes and builtin application arrays; updates string accessors.
sjsonnet/src-jvm/sjsonnet/stdlib/NativeXz.scala	Updates JVM xz builtin to accept Eval.
sjsonnet/src-jvm-native/sjsonnet/stdlib/NativeGzip.scala	Updates gzip builtin to accept Eval.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Copilot encountered an error and was unable to review this pull request. You can try again by re-requesting a review.

[Copilot]

Pull request overview

Copilot reviewed 25 out of 25 changed files in this pull request and generated 7 comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 26 out of 26 changed files in this pull request and generated 1 comment.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.