refactor(build): remove undefined symbols assertion for native objects

- Remove nm command execution for checking undefined symbols during build
- Add explanatory comment about native objects providing OS ABI to each other
- Update translator to only check undefined symbols in final ELF target
- Clarify that only unresolved imports in final executable cross host boundary
- Maintain auditor checks while removing intermediate object file validation

src/Build/NativeSourceProjectBuilder.php

@@ -414,10 +414,8 @@ final class NativeSourceProjectBuilder
         }
 
         $nm = $this->resolveExecutable('nm');
-        $auditor->assertUndefinedSymbols(
-            $project->target,
-            $this->runCapture([$nm, '-u', ...$objects], dirname($project->file)),
-        );
+        /* Native objects may deliberately provide an OS ABI to one another.
+         * The linked artifact is the actual host-capability boundary. */
         $auditor->assertUndefinedSymbols(
             $project->target,
             $this->runCapture(

src/Translator.php

@@ -2297,10 +2297,9 @@ CODE;
             );
             return;
         }
-        $auditor->assertUndefinedSymbols(
-            'native',
-            $this->captureNativeCommand(['nm', '-u', ...$objectFiles]),
-        );
+        /* Native objects may deliberately provide an OS ABI to one another
+         * (for example a freestanding syscall shim). Only unresolved imports
+         * in the final ELF cross the host-capability boundary. */
         $auditor->assertUndefinedSymbols(
             'native',
             $this->captureNativeCommand(['nm', '-u', $targetFile]),