fix(native)!: preserve Swift pointer nullability and import bindings

Resolve relative pointers using field-owned ABI encodings. Keep null, raw, rebased, imported and unknown targets distinct, and retain imported conformance rows with exact Mach-O binding provenance. Decode legacy rebase membership with source-derived memory and work bounds, preserving validated prefix facts when streams are incomplete.

Validation: check:ci, docs:check and build passed; 158 source tests and 20 schema/acceptance tests passed. Ten source-built Apple dispatch variants and four issue-specific CLI/MCP workflows passed without executing targets. Paired cold/warm CLI/MCP cost observations retained locally; model tokens and maximum-sized input runtime were not measured.

Closes #5683
Closes #5685

BREAKING CHANGE: Swift conformance type_name and protocol_name can be null when names cannot be resolved; consumers must use typed type_binding and protocol_binding evidence. MachoImportBinding replaces the former Objective-C-specific binding type and schema.

scripts/verify/apple/dispatch.mjs

@@ -30,7 +30,7 @@ const LINK_MODES = [
   {
     mode: "dyld-info",
     flags: ["-Wl,-no_fixup_chains"],
-    fixups: "LC_DYLD_INFO rebase opcodes were not decoded",
+    fixups: "LC_DYLD_INFO rebase opcodes",
     swift: true,
   },
   { mode: "chained", flags: [], fixups: "chained fixups:", swift: true },
@@ -70,6 +70,7 @@ const inspect = async (path) => {
 };
 
 const checkObjc = (metadata, mode) => {
+  assert.equal(fixupCoverage(metadata)?.status, "complete");
   const fixture = metadata.objc_classes.find(
     ({ name, is_meta_class: meta }) => name === "ReaDispatchFixture" && !meta,
   );
@@ -159,6 +160,7 @@ const checkObjc = (metadata, mode) => {
 };
 
 const checkSwift = (metadata, mode) => {
+  assert.equal(fixupCoverage(metadata)?.status, "complete");
   if (
     !metadata.swift_dispatch_slots.some(
       (slot) =>