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@@ -33,10 +33,9 @@ RUN pip install --no-cache-dir -r /tmp/requirements.txt
 COPY . .
 
 # ── Step 1: Resolve + precompile Julia packages ───────
-# Write Julia code to a temp script to avoid Docker misreading
-# Julia keywords (using/import) as Dockerfile instructions.
-RUN printf 'import Pkg\nPkg.instantiate()\nPkg.precompile()\nprintln("Julia packages resolved")\n' \
-    | julia --project=/app/src
+# Use a script file — avoids both Docker keyword parsing issues
+# and REPL-mode error isolation of the printf pipe approach.
+RUN julia --project=/app/src /app/src/setup_pkg.jl
 
 # ── Step 2: Warmup — JIT-compile all hot paths ────────
 RUN julia --project=/app/src /app/src/warmup.jl

src/Project.toml

@@ -1,5 +1,4 @@
 [deps]
-JSON3    = "0f8b85d8-7e73-4b43-9b43-f8e4f07d6bcd"
 Random   = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 

src/setup_pkg.jl

@@ -0,0 +1,4 @@
+import Pkg
+Pkg.instantiate()
+Pkg.precompile()
+println("Julia packages resolved ✓")