fix: close the tail items from the targeted re-audit

Resolves the 13 rows still partial in docs/rewrite/notes/review-rv4-
codex.md (details in final-Z5.md):
- Escaped config strings are decoded to raw bytes at every OS boundary:
  Flatpak cwd/argv to D-Bus, screen-file paths, the default config
  template, GHOSTTY_RESOURCES_DIR/TERMINFO/shell integration/
  bindtextdomain consumers, custom shader loading, list-themes hyperlinks.
- osbytes escapes literal U+FDD0 on non-Unix too (bijective everywhere);
  the GTK paste dialog only decodes text that was actually encoded.
- shadertoy: whole-array uses of iChannelTime rebuild a plain float[4]
  from the std140-padded members (naga-validated, MSL offsets checked).
- libghostty-vt: the OSC parser holds caller-allocated storage inline
  and command payloads borrow from it, so ghostty_osc_end performs no
  global allocations (verified from Rust and C).
- crash: aarch64 Linux minidump context fixed; macOS fatal signals record
  siginfo, registers and a fault-safe stack walk.
- tripwire: selectionString map allocation-failure cleanup test ported.
- libghostty-vt emits the versioned soname libghostty-vt.so.0 at build
  time (no patchelf needed at install).

Test Plan:
- cargo test --workspace (3342 passed)
- just check-macos; just check-macos x86_64-apple-darwin;
  just check-windows; just check-wasm
- cargo check --target aarch64-unknown-linux-gnu -p ghostty-crash

crates/ghostty-terminal/src/screen/tests/p5.rs

@@ -685,9 +685,31 @@ fn screen_set_attribute_splits_page_on_out_of_space_at_max_styles() {
     assert!(page_was_split);
 }
 
-// "selectionString map allocation failure cleanup" is skipped: it relies on
-// Zig tripwire allocation-failure injection (selectionString_tw), which has
-// no Rust counterpart.
+#[test]
+fn screen_selection_string_map_allocation_failure_cleanup() {
+    use crate::tripwire::ResetMode;
+
+    // If building the StringMap fails, the already-built string must be
+    // dropped and the error returned (Zig: errdefer free(map_string)).
+    let mut s = init(10, 5, 0);
+    s.test_write_string("hello").unwrap();
+    let sel = sel_active(&s, (0, 0), (4, 0), false);
+
+    selection_string_tw::error_always(
+        SelectionStringPoint::CopyMap,
+        SelectionStringError::OutOfMemory,
+    );
+    let result = s.try_selection_string_map(SelectionString { sel, trim: true });
+    assert!(matches!(result, Err(SelectionStringError::OutOfMemory)));
+    selection_string_tw::end(ResetMode::Reset).unwrap();
+
+    // And it works again once the tripwire is reset.
+    let map = s
+        .try_selection_string_map(SelectionString { sel, trim: true })
+        .unwrap();
+    assert_eq!(map.string, "hello");
+    assert_eq!(map.map.len(), 5);
+}
 
 fn setup_prompt(cols: u16, click: Click) -> Screen {
     let mut s = init(cols, 5, 0);