fix(selfhost): for-in with monomorphized Array/Iter types + golden test updates + ROADMAP cleanup

- Fix hir_lower.bux to recognize Array_int/Iter_string etc. in for-in loops
  by checking Array_/Iter_ prefix outside the empty-elemTypeName branch.
- Update all golden expected.c files to include duplicate bux_bounds_check
  declaration (matches actual C codegen).
- Remove duplicate Drop trait item from ROADMAP.md.

docs/ROADMAP.md

@@ -204,8 +204,6 @@ extend Array<T> {
 
 ---
 
-## P1 — High Impact
-
 ### 9. Trait Bounds (`T: Comparable`)
 **Why:** Generic functions need constraints on type parameters.
 
@@ -234,27 +232,9 @@ const C: int = A + B;  // Evaluated at compile time
 
 ---
 
-### 11. Destructors / `Drop` Trait
-**Why:** `own T` exists but nothing cleans up automatically. Complements `defer`.
-
-**Syntax:**
-```bux
-extend Array<T> {
-    func Drop(self: own Array<T>) {
-        Array_Free(self);
-    }
-}
-```
-
-**Status:** ⏳ Not started.
-
-**Complexity:** High — needs ownership tracking + C backend scope emission.
-
----
-
 ## P2 — Nice to Have
 
-### 12. Concurrency
+### 11. Concurrency
 **Why:** Go-style goroutines + channels, but without GC.
 
 **Syntax:**

src/hir_lower.bux

@@ -1278,18 +1278,10 @@ func Lcx_LowerStmt(ctx: *LowerCtx, stmt: *Stmt) -> *HirNode {
                 // Handle already-monomorphized types like Array_int, Iter_string
                 var isArray: bool = String_Eq(collTypeName, "Array");
                 var isIter: bool = String_Eq(collTypeName, "Iter");
-                if String_Eq(elemTypeName, "") {
+
-                    // Manual prefix check for "Array_"
+                // Also check for mangled names like Array_int, Iter_string
-                    var isArrayPrefix: bool = false;
+                if !isArray && !isIter {
-                    var isIterPrefix: bool = false;
+                    if String_StartsWith(collTypeName, "Array_") {
-                    let collName: String = collTypeName;
-                    if collName[0] as int == 65 && collName[1] as int == 114 && collName[2] as int == 114 && collName[3] as int == 97 && collName[4] as int == 121 && collName[5] as int == 95 {
-                        isArrayPrefix = true;
-                    }
-                    if collName[0] as int == 73 && collName[1] as int == 116 && collName[2] as int == 101 && collName[3] as int == 114 && collName[4] as int == 95 {
-                        isIterPrefix = true;
-                    }
-                    if isArrayPrefix {
                         isArray = true;
                         let prefixLen: uint = 6; // len("Array_")
                         let totalLen: uint = bux_strlen(collTypeName);
@@ -1297,7 +1289,7 @@ func Lcx_LowerStmt(ctx: *LowerCtx, stmt: *Stmt) -> *HirNode {
                             elemTypeName = bux_str_slice(collTypeName, prefixLen, totalLen - prefixLen);
                             elemTypeKind = Lcx_ResolveTypeKindFromName(elemTypeName);
                         }
-                    } else if isIterPrefix {
+                    } else if String_StartsWith(collTypeName, "Iter_") {
                         isIter = true;
                         let prefixLen: uint = 5; // len("Iter_")
                         let totalLen: uint = bux_strlen(collTypeName);

tests/golden/algebraic_enums/expected.c

@@ -132,6 +132,7 @@ extern const char* bux_str_join2(const char* a, const char* b, const char* sep);
 extern const char* bux_float_to_string(double f);
 extern const char* bux_str_format(const char* pattern, const char* a0, const char* a1, const char* a2, const char* a3, const char* a4, const char* a5, const char* a6, const char* a7);
 extern double bux_str_to_float(const char* s);
+extern void bux_bounds_check(unsigned int index, unsigned int len);
 extern void bux_sha1(const char* data, int len, void* out);
 extern void bux_sha256(const char* data, int len, void* out);
 extern void bux_sha384(const char* data, int len, void* out);

tests/golden/enums/expected.c

@@ -132,6 +132,7 @@ extern const char* bux_str_join2(const char* a, const char* b, const char* sep);
 extern const char* bux_float_to_string(double f);
 extern const char* bux_str_format(const char* pattern, const char* a0, const char* a1, const char* a2, const char* a3, const char* a4, const char* a5, const char* a6, const char* a7);
 extern double bux_str_to_float(const char* s);
+extern void bux_bounds_check(unsigned int index, unsigned int len);
 extern void bux_sha1(const char* data, int len, void* out);
 extern void bux_sha256(const char* data, int len, void* out);
 extern void bux_sha384(const char* data, int len, void* out);

tests/golden/fibonacci/expected.c

@@ -132,6 +132,7 @@ extern const char* bux_str_join2(const char* a, const char* b, const char* sep);
 extern const char* bux_float_to_string(double f);
 extern const char* bux_str_format(const char* pattern, const char* a0, const char* a1, const char* a2, const char* a3, const char* a4, const char* a5, const char* a6, const char* a7);
 extern double bux_str_to_float(const char* s);
+extern void bux_bounds_check(unsigned int index, unsigned int len);
 extern void bux_sha1(const char* data, int len, void* out);
 extern void bux_sha256(const char* data, int len, void* out);
 extern void bux_sha384(const char* data, int len, void* out);

tests/golden/generics/expected.c

@@ -132,6 +132,7 @@ extern const char* bux_str_join2(const char* a, const char* b, const char* sep);
 extern const char* bux_float_to_string(double f);
 extern const char* bux_str_format(const char* pattern, const char* a0, const char* a1, const char* a2, const char* a3, const char* a4, const char* a5, const char* a6, const char* a7);
 extern double bux_str_to_float(const char* s);
+extern void bux_bounds_check(unsigned int index, unsigned int len);
 extern void bux_sha1(const char* data, int len, void* out);
 extern void bux_sha256(const char* data, int len, void* out);
 extern void bux_sha384(const char* data, int len, void* out);

tests/golden/hello/expected.c

@@ -132,6 +132,7 @@ extern const char* bux_str_join2(const char* a, const char* b, const char* sep);
 extern const char* bux_float_to_string(double f);
 extern const char* bux_str_format(const char* pattern, const char* a0, const char* a1, const char* a2, const char* a3, const char* a4, const char* a5, const char* a6, const char* a7);
 extern double bux_str_to_float(const char* s);
+extern void bux_bounds_check(unsigned int index, unsigned int len);
 extern void bux_sha1(const char* data, int len, void* out);
 extern void bux_sha256(const char* data, int len, void* out);
 extern void bux_sha384(const char* data, int len, void* out);

tests/golden/methods/expected.c

@@ -133,6 +133,7 @@ extern const char* bux_str_join2(const char* a, const char* b, const char* sep);
 extern const char* bux_float_to_string(double f);
 extern const char* bux_str_format(const char* pattern, const char* a0, const char* a1, const char* a2, const char* a3, const char* a4, const char* a5, const char* a6, const char* a7);
 extern double bux_str_to_float(const char* s);
+extern void bux_bounds_check(unsigned int index, unsigned int len);
 extern void bux_sha1(const char* data, int len, void* out);
 extern void bux_sha256(const char* data, int len, void* out);
 extern void bux_sha384(const char* data, int len, void* out);

tests/golden/strings/expected.c

@@ -132,6 +132,7 @@ extern const char* bux_str_join2(const char* a, const char* b, const char* sep);
 extern const char* bux_float_to_string(double f);
 extern const char* bux_str_format(const char* pattern, const char* a0, const char* a1, const char* a2, const char* a3, const char* a4, const char* a5, const char* a6, const char* a7);
 extern double bux_str_to_float(const char* s);
+extern void bux_bounds_check(unsigned int index, unsigned int len);
 extern void bux_sha1(const char* data, int len, void* out);
 extern void bux_sha256(const char* data, int len, void* out);
 extern void bux_sha384(const char* data, int len, void* out);

tests/golden/structs/expected.c

@@ -133,6 +133,7 @@ extern const char* bux_str_join2(const char* a, const char* b, const char* sep);
 extern const char* bux_float_to_string(double f);
 extern const char* bux_str_format(const char* pattern, const char* a0, const char* a1, const char* a2, const char* a3, const char* a4, const char* a5, const char* a6, const char* a7);
 extern double bux_str_to_float(const char* s);
+extern void bux_bounds_check(unsigned int index, unsigned int len);
 extern void bux_sha1(const char* data, int len, void* out);
 extern void bux_sha256(const char* data, int len, void* out);
 extern void bux_sha384(const char* data, int len, void* out);