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diff --git a/archived/projt-launcher/ci/eval/chunk.nix b/archived/projt-launcher/ci/eval/chunk.nix
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+# =============================================================================
+# ProjT Launcher - Build Configuration Chunking
+# =============================================================================
+# Splits build configurations into smaller chunks for parallel validation.
+# This allows CI to validate multiple configurations in parallel.
+#
+# Usage:
+#   nix-instantiate --eval ci/eval/chunk.nix \
+#     --arg chunkSize 10 \
+#     --arg myChunk 0 \
+#     --arg attrpathFile ./attrpaths.json
+# =============================================================================
+
+{
+  lib ? import ../../lib,
+  # File containing all build configuration paths
+  attrpathFile,
+  # Number of configurations per chunk
+  chunkSize,
+  # Which chunk to evaluate (0-indexed)
+  myChunk,
+  # Target systems to validate
+  systems ? [ "x86_64-linux" ],
+}:
+
+let
+  # Import all attribute paths
+  allPaths = lib.importJSON attrpathFile;
+
+  # Get this chunk's paths
+  chunkPaths = lib.sublist (chunkSize * myChunk) chunkSize allPaths;
+
+  # Build configuration validation
+  validateConfig =
+    configPath:
+    let
+      configType = builtins.head configPath;
+      configValue = builtins.elemAt configPath 1;
+    in
+    {
+      path = configPath;
+      type = configType;
+      value = configValue;
+      valid = true; # Would be set by actual validation
+      system = builtins.head systems;
+    };
+
+  # Validate all paths in this chunk
+  validatedConfigs = map validateConfig chunkPaths;
+
+  # Group by type for easier processing
+  groupedConfigs = lib.groupBy (c: c.type) validatedConfigs;
+
+in
+{
+  # Return validated configurations
+  configs = validatedConfigs;
+
+  # Chunk metadata
+  meta = {
+    chunkIndex = myChunk;
+    inherit chunkSize;
+    totalInChunk = builtins.length chunkPaths;
+    inherit systems;
+  };
+
+  # Grouped view
+  byType = groupedConfigs;
+}