Replace array[T]/map[K,V] syntax with []T/map[K]V

- SliceType: `[]T` replaces `array[T]` everywhere types are valid —
  struct fields, function params, return types, typed var decls,
  named type declarations, interface methods, variant arms
- MapType: `map[K]V` replaces `map[K,V]` (Go-style, no comma)
- Bare `array` and bare `map` in type positions are now compile errors
  (UnexpectedToken); use `[]any`/`map[K]V` instead
- `type JobQueue []Job` and `type Scores map[string]int` work as named types
- Update all spec files, fail specs, and simlab playground files
- Add fail/099 and fail/100 to document the bare-keyword errors

Author: ganehag

examples/spec/014_struct_typed_fields.gengo

@@ -1,7 +1,7 @@
 std := import("std")
 
 type Addr struct { city string }
-type User struct { id int, name string, active bool, score float, tags array, meta map, addr Addr }
+type User struct { id int, name string, active bool, score float, tags []int, meta map[string]int, addr Addr }
 
 u := User{
   id: 7,

examples/spec/063_for_in_break_continue.gengo

@@ -1,6 +1,6 @@
 std := import("std")
 
-func sum_until_sentinel(arr array) int {
+func sum_until_sentinel(arr []int) int {
     acc := 0
     for x in arr {
         if x == 99 { break }
@@ -9,7 +9,7 @@ func sum_until_sentinel(arr array) int {
     return acc
 }
 
-func sum_skip_zero(arr array) int {
+func sum_skip_zero(arr []int) int {
     acc := 0
     for x in arr {
         if x == 0 { continue }
@@ -18,7 +18,7 @@ func sum_skip_zero(arr array) int {
     return acc
 }
 
-func count_kv_before_sentinel(m map) int {
+func count_kv_before_sentinel(m map[string]int) int {
     count := 0
     for k, v in m {
         if k == "stop" { break }
@@ -55,7 +55,7 @@ func sum_cfor_with_continue(n int) int {
     return s
 }
 
-func sum_with_local_in_break_block(arr array) int {
+func sum_with_local_in_break_block(arr []int) int {
     acc := 0
     for x in arr {
         if x == 99 {
@@ -68,7 +68,7 @@ func sum_with_local_in_break_block(arr array) int {
     return acc
 }
 
-func sum_body_local(arr array) int {
+func sum_body_local(arr []int) int {
     acc := 0
     for x in arr {
         doubled := x * 2

examples/spec/068_typed_decl_coerce_assert.gengo

@@ -17,12 +17,12 @@ std.io.println(r)
 r2 rune = `Z`
 std.io.println(r2)
 
-// array: enforces type
-a array = [1, 2, 3]
+// []T: enforces sequence type
+a []int = [1, 2, 3]
 std.io.println(std.core.len(a))
 
-// map: enforces type
-m map = {x: 1, y: 2}
+// map[K]V: enforces map type
+m map[string]int = {x: 1, y: 2}
 std.io.println(std.core.len(m))
 
 // error: enforces type

examples/spec/078_typed_collections.gengo

@@ -1,8 +1,8 @@
 std := import("std")
 
 type Point struct { x float, y float }
-type Points array[Point]
-type Index map[string, Point]
+type Points []Point
+type Index map[string]Point
 
 // Construct named collection types
 pts := Points([Point{x: 1.0, y: 2.0}, Point{x: 3.0, y: 4.0}])
@@ -26,7 +26,7 @@ idx := Index({"origin": Point{x: 0.0, y: 0.0}})
 std.io.println(idx["origin"].x)
 
 // Anonymous typed annotation in function param
-func sumX(ps array[Point]) float {
+func sumX(ps []Point) float {
     total float = 0.0
     for p in ps {
         total += p.x

examples/spec/fail/071_typed_decl_array_mismatch.gengo

@@ -1 +1 @@
-x array = "not an array"
+x []any = "not an array"

examples/spec/fail/072_typed_decl_map_mismatch.gengo

@@ -1 +1 @@
-x map = [1, 2, 3]
+x map[string]any = [1, 2, 3]

examples/spec/fail/085_typed_array_wrong_element.gengo

@@ -1,4 +1,4 @@
 type Point struct { x float, y float }
-type Points array[Point]
+type Points []Point
 
 _ := Points([Point{x: 1.0, y: 2.0}, "not a point"])

examples/spec/fail/086_typed_array_param_wrong.gengo

@@ -1,6 +1,6 @@
 type Point struct { x float, y float }
 
-func sumX(ps array[Point]) float {
+func sumX(ps []Point) float {
     return 0.0
 }
 

examples/spec/fail/087_typed_array_append_wrong.gengo

@@ -1,7 +1,7 @@
 std := import("std")
 
 type Point struct { x float, y float }
-type Points array[Point]
+type Points []Point
 
 pts := Points([Point{x: 1.0, y: 2.0}])
 _ := std.core.append(pts, "not a point")

examples/spec/fail/088_typed_map_wrong_value.gengo

@@ -1,4 +1,4 @@
 type Point struct { x float, y float }
-type Index map[string, Point]
+type Index map[string]Point
 
 _ := Index({"a": Point{x: 1.0, y: 2.0}, "b": 42})