ci: fix the Linux build and the macOS SRT walker test crashes (#1922)

* graphics: give InlinePageOwnerList's const_iterator iterator traits

The Linux build failed in textureCache.cpp: std::any_of over the image
owners of a page needs std::iterator_traits, which libstdc++ only fills
from the iterator's own member types. MSVC's STL and libc++ don't
consult them there, so Windows and macOS built.

Declare the five member types. The category is input, not forward,
because operator* returns a copy.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* tests: assert InlinePageOwnerList's const_iterator has an input category

Only libstdc++ needs the iterator traits for std::any_of, so removing
them would compile on Windows and macOS and break only the Linux build.
The assert fails the build on every platform instead.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* tests: serve SRT walker test loads on macOS too

FakeGuestMemory only installed its fault handler on Linux and Windows,
so on macOS the walker's deliberately faulting loads crashed
scalar_provenance, resource_materialization and resource_tracking.

Share the Linux sigaction path with macOS, read the registers from the
macOS thread state, and catch SIGBUS as well as SIGSEGV there, like the
emulator's own handler.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

tests/ImagePageTableTests.cpp

@@ -3,6 +3,8 @@
 #include <cstdint>
 #include <cstdio>
 #include <cstdlib>
+#include <iterator>
+#include <type_traits>
 #include <utility>
 #include <vector>
 
@@ -13,6 +15,11 @@ using Table      = Libs::Graphics::MultiLevelPageTable<Owners, 20, 44, 14>;
 using PageOwners = Libs::Graphics::InlinePageOwnerList<uint32_t, 16>;
 using OwnerTable = Libs::Graphics::MultiLevelPageTable<PageOwners, 20, 44, 14>;
 
+// MSVC's STL and libc++ don't need these traits for std::any_of, but libstdc++ does, so only a
+// Linux build would notice them missing.
+static_assert(std::is_same_v<std::iterator_traits<PageOwners::const_iterator>::iterator_category,
+                             std::input_iterator_tag>);
+
 void Check(bool value, const char* text) {
 	if (!value) {
 		std::fprintf(stderr, "ImagePageTableTests: failed: %s\n", text);