Fix lint issues: remove separator comments and dead code

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: rtfeldman

src/backend/dev/object/elf.zig

@@ -558,4 +558,3 @@ test "elf with external symbol" {
     // Should produce valid ELF
     try std.testing.expectEqualSlices(u8, "\x7fELF", output.items[0..4]);
 }
-

src/backend/dev/object/macho.zig

@@ -518,4 +518,3 @@ test "macho with external call" {
     const magic = std.mem.readInt(u32, output.items[0..4], .little);
     try std.testing.expectEqual(MachO.MH_MAGIC_64, magic);
 }
-

src/eval/comptime_value.zig

@@ -35,10 +35,8 @@ pub const TopLevelBindings = struct {
     }
 };
 
-// =============================================================================
-// Legacy types for backward compatibility during migration
-// These will be removed once the full refactor is complete
-// =============================================================================
+// Legacy types for backward compatibility during migration.
+// These will be removed once the full refactor is complete.
 
 /// Simple heap for allocating memory during evaluation.
 /// Uses an arena so everything can be freed at once.
@@ -151,10 +149,6 @@ pub const ComptimeEnv = struct {
     }
 };
 
-// =============================================================================
-// Tests
-// =============================================================================
-
 test "TopLevelBindings bind and lookup" {
     var bindings = TopLevelBindings.init(std.testing.allocator);
     defer bindings.deinit();

src/eval/dev_evaluator.zig

@@ -32,7 +32,6 @@ const ComptimeHeap = comptime_value.ComptimeHeap;
 const ComptimeValue = comptime_value.ComptimeValue;
 const ComptimeEnv = comptime_value.ComptimeEnv;
 const TopLevelBindings = comptime_value.TopLevelBindings;
-const DependencyGraph = can.DependencyGraph;
 
 /// Dev backend-based evaluator for Roc expressions
 pub const DevEvaluator = struct {
@@ -1930,10 +1929,6 @@ test "generate f64 code" {
     try std.testing.expectApproxEqRel(@as(f64, 3.14159), result, 0.0001);
 }
 
-// =============================================================================
-// Result pointer tests - verify code writes to the landing pad correctly
-// =============================================================================
-
 test "result pointer: i64 value written to memory" {
     var evaluator = DevEvaluator.init(std.testing.allocator) catch |err| {
         return switch (err) {