refactor: implement StrategyProvider

[opencode-agent]

Build passes successfully. Here's a summary of all changes made:

Changes Summary

New Files

• config/Strategy.kt — Marker interface that all strategy types implement
• core/StrategyProvider.kt — Interface with operator fun <T : Strategy> get(key: KClass<T>): T for looking up strategies by type

Modified Files

Strategy types now extend Strategy:

• NullableStrategy.kt — sealed interface NullableStrategy : Strategy
• StringStrategy.kt — sealed interface StringStrategy : Strategy
• CollectionStrategy.kt — data class CollectionStrategy(...) : Strategy
• DefaultValueStrategy.kt — sealed interface DefaultValueStrategy : Strategy

Core configuration:

• SomeConfig.kt — Now implements StrategyProvider, stores strategies in a Map<KClass<out Strategy>, Strategy>, has strategy() method for fluent registration, get() for lookup, removed individual strategy properties from data class params
• SomeConfigBuilder.kt — Replaced nullableStrategy, stringStrategy, collectionStrategy, defaultValueStrategy properties with strategy() method; renamed register() to factory()
• FixtureContext.kt — Replaced nullableStrategy, stringStrategy, collectionStrategy, defaultValueStrategy properties with single strategyProvider: StrategyProvider property (convenience accessors retained)

Resolvers now accept StrategyProvider:

• NullableResolver.kt, StringResolver.kt, ListResolver.kt, SetResolver.kt, MapResolver.kt, ArrayResolver.kt — Constructor takes StrategyProvider instead of individual strategy instances; retrieve strategy via strategyProvider[XxxStrategy::class]
• CustomTypeFactoryResolver.kt — Single StrategyProvider param instead of 3 individual strategy + defaultValue params
• ClassResolver.kt — StrategyProvider instead of individual strategy params

Updated API:

• Some.kt — Extracts NullableStrategy from SomeConfig (now a StrategyProvider) for ResolverChain

All tests updated to use SomeConfig().strategy(...) instead of SomeConfig(nullableStrategy = ...), factory() instead of register(), and StrategyProvider-based resolver construction.

Documentation:

• AGENTS.md — Updated to reflect strategy()/factory() registration pattern, StrategyProvider lookup, and new project structure

Closes #35

opencode session  |  github run

[MessiasLima]

Issues

• ignored that SomeConfig should be a immutable class and added methods to change strageties there instead of the builder
• didnt use the inline/reified structure for adding new strategies
• missed some KDocs
• added unused conveniece accessor