feat: implement relative import resolution with normalized paths and update all test modules

Replace the flat module name-to-path mapping with a proper relative import resolver that handles "./" and "../" prefixes relative to the importer's directory. This is a breaking change: existing imports in user code that assume paths are relative to the entrypoint file will now fail. Stack trace output and host API calls now use the resolved module string instead of the short import name. Update all test fixtures to use "./" relative imports and adjust C test files to pass the full resolved module path to wrenGetVariable.

test/language/foreign/unknown_method.wren

@@ -1,3 +1,3 @@
 class Foo {
-  foreign someUnknownMethod // expect runtime error: Could not find foreign method 'someUnknownMethod' for class Foo in module 'main'.
+  foreign someUnknownMethod // expect runtime error: Could not find foreign method 'someUnknownMethod' for class Foo in module 'test/language/foreign/unknown_method'.
 }

test/language/module/change_imported_value/change_imported_value.wren

@@ -1,4 +1,4 @@
-import "module" for Module, Other
+import "./module" for Module, Other
 
 System.print(Module) // expect: before
 

test/language/module/compile_error/compile_error.wren

@@ -1,2 +1,2 @@
 System.print("before") // expect: before
-import "module" for Module // expect runtime error: Could not compile module 'module'.
+import "./module" for Module // expect runtime error: Could not compile module 'test/language/module/compile_error/module'.

test/language/module/cyclic_import/a.wren

@@ -3,7 +3,7 @@ System.print("start a")
 
 var A = "a value"
 System.print("a defined %(A)")
-import "b" for B
+import "./b" for B
 System.print("a imported %(B)")
 
 System.print("end a")

test/language/module/cyclic_import/b.wren

@@ -3,7 +3,7 @@ System.print("start b")
 
 var B = "b value"
 System.print("b defined %(B)")
-import "a" for A
+import "./a" for A
 System.print("b imported %(A)")
 
 System.print("end b")

test/language/module/cyclic_import/cyclic_import.wren

@@ -1,4 +1,4 @@
-import "a"
+import "./a"
 
 // Shared module should only run once:
 // expect: start a

test/language/module/implicitly_imports_core/implicitly_imports_core.wren

@@ -1,4 +1,4 @@
-import "module"
+import "./module"
 // expect: Bool
 // expect: Class
 // expect: Fiber

test/language/module/inside_block/inside_block.wren

@@ -1,7 +1,7 @@
 var Module = "outer"
 
 if (true) {
-  import "module" for Module
+  import "./module" for Module
   // expect: ran module
 
   System.print(Module) // expect: from module

test/language/module/missing_for.wren

@@ -1 +1 @@
-import "module" NoString // expect error
+import "./module" NoString // expect error

test/language/module/module_dir/module_dir.wren

@@ -1,3 +1,3 @@
-import "something" for Index
+import "./something/module" for Index
 
 System.print(Index) // expect: index

test/language/module/multiple_variables/multiple_variables.wren

@@ -1,4 +1,4 @@
-import "module" for Module1, Module2, Module3, Module4, Module5
+import "./module" for Module1, Module2, Module3, Module4, Module5
 
 // Only execute module body once:
 // expect: ran module

test/language/module/name_collision.wren

@@ -1,2 +1,2 @@
 var Collides
-import "module" for Collides // expect error
+import "./module" for Collides // expect error

test/language/module/newlines/newlines.wren

@@ -1,9 +1,9 @@
 import
 
 
-"module"
+"./module"
 
-import "module" for
+import "./module" for
 
 A,
 

test/language/module/no_variable/no_variable.wren

@@ -1,2 +1,2 @@
-import "module"
+import "./module"
 // expect: ran module

test/language/module/relative_import/module_3.wren

@@ -0,0 +1,2 @@
+// nontest
+System.print("module_3")

test/language/module/relative_import/relative_import.wren

@@ -0,0 +1,8 @@
+import "./sub/module"
+import "./sub/././///dir/module"
+// expect: sub/module
+// expect: sub/module_2
+// expect: sub/dir/module
+// expect: sub/dir/module_2
+// expect: sub/module_3
+// expect: module_3

test/language/module/relative_import/sub/dir/module.wren

@@ -0,0 +1,3 @@
+// nontest
+System.print("sub/dir/module")
+import "./module_2"

test/language/module/relative_import/sub/dir/module_2.wren

@@ -0,0 +1,4 @@
+// nontest
+System.print("sub/dir/module_2")
+import "../module_3"
+import "../../module_3"

test/language/module/relative_import/sub/module.wren

@@ -0,0 +1,3 @@
+// nontest
+System.print("sub/module")
+import "./module_2"

test/language/module/relative_import/sub/module_2.wren

@@ -0,0 +1,2 @@
+// nontest
+System.print("sub/module_2")

test/language/module/relative_import/sub/module_3.wren

@@ -0,0 +1,2 @@
+// nontest
+System.print("sub/module_3")

test/language/module/shared_import/a.wren

@@ -1,5 +1,5 @@
 // nontest
 System.print("a")
-import "shared" for Shared
+import "./shared" for Shared
 var A = "a %(Shared)"
 System.print("a done")

test/language/module/shared_import/b.wren

@@ -1,5 +1,5 @@
 // nontest
 System.print("b")
-import "shared" for Shared
+import "./shared" for Shared
 var B = "b %(Shared)"
 System.print("b done")

test/language/module/shared_import/shared_import.wren

@@ -1,5 +1,5 @@
-import "a" for A
-import "b" for B
+import "./a" for A
+import "./b" for B
 
 // Shared module should only run once:
 // expect: a

test/language/module/simple_import/simple_import.wren

@@ -1,4 +1,4 @@
-import "module" for Module
+import "./module" for Module
 // expect: ran module
 
 System.print(Module) // expect: from module

test/language/module/unknown_module.wren

@@ -1 +1 @@
-import "does_not_exist" for DoesNotExist // expect runtime error: Could not load module 'does_not_exist'.
+import "./does_not_exist" for DoesNotExist // expect runtime error: Could not load module 'test/language/module/does_not_exist'.

test/language/module/unknown_variable/unknown_variable.wren

@@ -1,3 +1,3 @@
 // Should execute the module:
 // expect: ran module
-import "module" for DoesNotExist // expect runtime error: Could not find a variable named 'DoesNotExist' in module 'module'.
+import "./module" for DoesNotExist // expect runtime error: Could not find a variable named 'DoesNotExist' in module 'test/language/module/unknown_variable/module'.