fix(build-gate): resolve commands by toolchain (#40)

core/artifacts/AGENTS.md

@@ -16,6 +16,7 @@ CORREX kernel team.
 - `ArtifactState` rebuilt from events via `DefaultArtifactReducer` (in `core:events` `ArtifactEvents.kt`) + `ArtifactProjector`.
 - `TypedArtifactSlot<T>` — typed accessor for well-known artifact slots.
 - `ArtifactSerializationModule` — registers artifact polymorphic types; must be included in serialization setup.
+- `KindContractTable.toolchainFor` maps checked-in Node and JVM kinds to the execution-gate command namespace.
 - Hard Invariant #1: artifact state is always rebuilt from events. `ArtifactRepository` wraps `EventReplayer<ArtifactState>`.
 
 ## Work Guidance

core/artifacts/src/main/kotlin/com/correx/core/artifacts/kind/KindContractTable.kt

@@ -18,6 +18,12 @@ package com.correx.core.artifacts.kind
  */
 object KindContractTable {
 
+    /** Toolchain selected by the build gate for a produced source or manifest kind. */
+    enum class Toolchain(val profileKey: String) {
+        NODE("node"),
+        JVM("jvm"),
+    }
+
     /** A single assertion template — a kind's requirement before it is bound to a concrete path. */
     private data class Template(
         val id: String,
@@ -133,6 +139,9 @@ object KindContractTable {
 
     private val CHECKED_IN: Map<String, List<Template>> = TS_REACT + KOTLIN + GENERIC
 
+    private val TOOLCHAINS = TS_REACT.keys.associateWith { Toolchain.NODE } +
+        KOTLIN.keys.associateWith { Toolchain.JVM }
+
     /** Project-supplied additive overrides, keyed by kind id. Set at wiring time; empty by default. */
     @Volatile
     var projectOverrides: Map<String, List<ContractAssertion>> = emptyMap()
@@ -157,5 +166,8 @@ object KindContractTable {
         return (base + overrides).filterNot { it.id == "file_nonempty" && isDotfile(path) }
     }
 
+    /** The build toolchain implied by a checked-in kind, or null for stack-neutral kinds. */
+    fun toolchainFor(kindId: String): Toolchain? = TOOLCHAINS[kindId]
+
     private fun isDotfile(path: String): Boolean = path.substringAfterLast('/').startsWith(".")
 }

core/artifacts/src/test/kotlin/com/correx/core/artifacts/kind/KindContractTableTest.kt

@@ -101,4 +101,13 @@ class KindContractTableTest {
         assertTrue("contains" in ids, "override assertion must be appended")
         assertTrue("file_nonempty" in ids, "checked-in assertions remain")
     }
+
+    @Test
+    fun `toolchain follows checked in source and manifest kinds`() {
+        assertEquals(KindContractTable.Toolchain.NODE, KindContractTable.toolchainFor("react_entry"))
+        assertEquals(KindContractTable.Toolchain.NODE, KindContractTable.toolchainFor("package_json"))
+        assertEquals(KindContractTable.Toolchain.JVM, KindContractTable.toolchainFor("kotlin_service"))
+        assertEquals(KindContractTable.Toolchain.JVM, KindContractTable.toolchainFor("gradle_module"))
+        assertEquals(null, KindContractTable.toolchainFor("docs"))
+    }
 }