zynml: add parallel '&' grammar + docs/examples conformance suite

Author: darmie

crates/zynml/examples/hello_no_fstring.zynml

@@ -0,0 +1,41 @@
+// Hello world without f-strings
+import prelude
+import tensor
+
+def main() {
+    println("Hello from ZynML!")
+
+    // Create tensors using static methods
+    let a = Tensor::arange(1.0, 5.0, 1.0)  // [1.0, 2.0, 3.0, 4.0]
+    let b = Tensor::arange(5.0, 9.0, 1.0)  // [5.0, 6.0, 7.0, 8.0]
+
+    println("Tensor a:")
+    println_any(a)
+
+    println("Tensor b:")
+    println_any(b)
+
+    // Arithmetic operations using operator overloading
+    let sum = a + b
+    println("a + b:")
+    println_any(sum)
+
+    let diff = b - a
+    println("b - a:")
+    println_any(diff)
+
+    let prod = a * b
+    println("a * b (element-wise):")
+    println_any(prod)
+
+    // Reduction operations
+    let total = a.sum()
+    println("Sum of a:")
+    println_any(total)
+
+    let avg = a.mean()
+    println("Mean of a:")
+    println_any(avg)
+
+    println("Done!")
+}

crates/zynml/examples/test_bool_simple.zynml

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+// Test simple bool return
+def main() {
+    let x = 1
+    let y = 2
+    let result = x < y
+    extern println_int(result)
+}

crates/zynml/examples/test_fstring_direct.zynml

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+// Test f-string with direct extern call
+def main() {
+    let name = "World"
+    let result = extern concat("Hello ", name)
+    extern println_str(result)
+}

crates/zynml/examples/test_fstring_minimal.zynml

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+// Minimal f-string test without prelude
+def main() {
+    let name = "World"
+    extern println_str(f"Hello {name}!")
+}

crates/zynml/examples/test_fstring_prelude.zynml

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+// F-string test with prelude using println_str
+import prelude
+
+def main() {
+    let name = "World"
+    extern println_str(f"Hello {name}!")
+    
+    let x = 42
+    extern println_str(f"The answer is {x}")
+}

crates/zynml/examples/test_fstring_println.zynml

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+// F-string test using println (should work with dynamic dispatch)
+import prelude
+
+def main() {
+    let name = "World"
+    println(f"Hello {name}!")
+    
+    let x = 42
+    println(f"The answer is {x}")
+}

crates/zynml/examples/test_fstring_simple.zynml

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+// Simple f-string test using extern println_str
+def main() {
+    let name = "World"
+    extern println_str(f"Hello {name}!")
+    
+    let x = 42
+    extern println_str(f"The answer is {x}")
+}

crates/zynml/examples/test_fstring_with_prelude.zynml

@@ -0,0 +1,7 @@
+// F-string test with prelude
+import prelude
+
+def main() {
+    let name = "World"
+    extern println_str(f"Hello {name}!")
+}

crates/zynml/examples/test_prelude_fstring.zynml

@@ -0,0 +1,7 @@
+// Test prelude with f-string
+import prelude
+
+def main() {
+    let x = 42
+    println(f"Value: {x}")
+}

crates/zynml/examples/test_prelude_only.zynml

@@ -0,0 +1,6 @@
+// Test prelude import only
+import prelude
+
+def main() {
+    println("Hello")
+}