fix: Windows core build, embedded init, byte-exact paths, version info

Closes the remaining core/lib/termio/GTK rows (final-Z2.md):
- ghostty-core compiles for Windows (Unix-only exec fields and file
  modes gated); checked with cargo check --target x86_64-pc-windows-gnu.
- Embedded init: ensure_locale, SIGPIPE ignored in ghostty_init for
  C/Swift hosts, Apple crash tags; the argv passed to ghostty_init feeds
  ghostty_config_load_cli_args; ghostty_config_load_file accepts
  non-UTF-8 paths.
- OSC 7 pwd, embedded surface cwd/command/env/initial input,
  ghostty_surface_text and GTK file drops keep raw bytes.
- XTVERSION, TERM_PROGRAM_VERSION, the About dialog and crash metadata
  use ghostty_build_info instead of hardcoded versions.

Test Plan:
- cargo test --workspace (3327 passed)
- cargo clippy --workspace --all-targets -- -D warnings

crates/ghostty-core/src/surface/binding.rs

@@ -424,6 +424,7 @@ pub fn write_screen_temp_file(
     loc: WriteScreenLoc,
     emit: WriteScreenFormat,
 ) -> Result<String, CoreError> {
+    #[cfg(unix)]
     use std::os::unix::fs::OpenOptionsExt as _;
 
     // Create a temporary directory to store our scrollback.
@@ -432,12 +433,11 @@ pub fn write_screen_temp_file(
     let file_path = tmp_dir.path().join(&filename);
 
     let result = (|| -> Result<String, CoreError> {
-        let mut file = std::fs::OpenOptions::new()
-            .write(true)
-            .create(true)
-            .truncate(true)
-            .mode(0o600)
-            .open(&file_path)?;
+        let mut opts = std::fs::OpenOptions::new();
+        opts.write(true).create(true).truncate(true);
+        #[cfg(unix)]
+        opts.mode(0o600);
+        let mut file = opts.open(&file_path)?;
         file.write_all(contents.as_bytes())?;
         file.flush()?;
         Ok(std::fs::canonicalize(&file_path)?
@@ -1272,10 +1272,13 @@ mod tests {
         assert!(path.ends_with("screen.txt"));
         let read = std::fs::read_to_string(&path).unwrap();
         assert_eq!(read, s);
-        let mode = std::os::unix::fs::PermissionsExt::mode(
-            &std::fs::metadata(&path).unwrap().permissions(),
-        );
-        assert_eq!(mode & 0o777, 0o600);
+        #[cfg(unix)]
+        {
+            let mode = std::os::unix::fs::PermissionsExt::mode(
+                &std::fs::metadata(&path).unwrap().permissions(),
+            );
+            assert_eq!(mode & 0o777, 0o600);
+        }
         let _ = std::fs::remove_dir_all(std::path::Path::new(&path).parent().unwrap());
     }
 

crates/ghostty-core/src/surface/clipboard.rs

@@ -215,6 +215,12 @@ impl Surface {
         }
     }
 
+    /// [`Surface::complete_clipboard_request`] for a paste of raw bytes
+    /// (Zig passes `[]const u8`; e.g. dropped non-UTF-8 file names).
+    pub fn complete_paste_bytes(&self, data: &[u8], confirmed: bool) -> Result<(), ClipboardError> {
+        self.complete_clipboard_paste(data, confirmed)
+    }
+
     /// Paste text (also the target of `text_callback`).
     pub(crate) fn complete_clipboard_paste(
         &self,
@@ -390,7 +396,13 @@ impl Surface {
 
     /// `textCallback`: text input that is pasted verbatim.
     pub fn text_callback(&self, text: &str) -> Result<(), ClipboardError> {
+        self.text_callback_bytes(text.as_bytes())
+    }
+
+    /// [`Surface::text_callback`] for raw bytes (Zig takes `[]const u8`;
+    /// the embedded `ghostty_surface_text` forwards the host bytes as is).
+    pub fn text_callback_bytes(&self, text: &[u8]) -> Result<(), ClipboardError> {
         let _crash = self.crash_guard();
-        self.complete_clipboard_paste(text.as_bytes(), true)
+        self.complete_clipboard_paste(text, true)
     }
 }

crates/ghostty-core/src/surface/mod.rs

@@ -471,10 +471,15 @@ impl Surface {
                 .and_then(|wd| wd.value())
                 .map(str::to_owned);
             ecfg.resources_dir = global::state().resources_dir.host().map(str::to_owned);
-            ecfg.rt_pre_exec_info = ghostty_termio::command::RtPreExecInfo::init(&config);
-            ecfg.rt_post_fork_info = ghostty_termio::command::RtPostForkInfo::init(&config);
-            ecfg.create_scope = rt_surface.create_scope_fn();
-            ecfg.restore_rlimit = global::state().rlimits.nofile;
+            // The Windows exec backend has no pre-exec/post-fork hooks,
+            // cgroup scopes or rlimits (Zig: Linux/POSIX only).
+            #[cfg(unix)]
+            {
+                ecfg.rt_pre_exec_info = ghostty_termio::command::RtPreExecInfo::init(&config);
+                ecfg.rt_post_fork_info = ghostty_termio::command::RtPostForkInfo::init(&config);
+                ecfg.create_scope = rt_surface.create_scope_fn();
+                ecfg.restore_rlimit = global::state().rlimits.nofile;
+            }
 
             let exec = Exec::new(ecfg)?;
             let args = exec.args().to_vec();
@@ -935,7 +940,9 @@ impl Surface {
             }
 
             Message::PwdChange(w) => {
-                let pwd = String::from_utf8_lossy(w.slice()).into_owned();
+                // Keep the OSC 7 bytes (see `Pwd`): non-UTF-8 bytes are
+                // carried with the reversible byte escape.
+                let pwd = ghostty_os::osbytes::bytes_to_config_string(w.slice());
                 self.perform(RtAction::Pwd(Pwd { pwd }));
             }
 
@@ -1364,7 +1371,14 @@ impl Surface {
     pub fn pwd(&self) -> Option<String> {
         let t = self.lock_terminal();
         let pwd = t.get_pwd()?;
-        Some(String::from_utf8_lossy(pwd).into_owned())
+        Some(ghostty_os::osbytes::bytes_to_config_string(pwd))
+    }
+
+    /// The raw bytes of [`Surface::pwd`] (Zig returns the OSC 7 bytes as is).
+    #[must_use]
+    pub fn pwd_bytes(&self) -> Option<Vec<u8>> {
+        let t = self.lock_terminal();
+        t.get_pwd().map(<[u8]>::to_vec)
     }
 
     /// Returns the x/y coordinate of where the IME (Input Method Editor)
@@ -2055,6 +2069,10 @@ impl CoreSurface for Surface {
         Surface::complete_clipboard_request(self, req, data, confirmed)
     }
 
+    fn complete_paste_bytes(&self, data: &[u8], confirmed: bool) -> Result<(), ClipboardError> {
+        Surface::complete_paste_bytes(self, data, confirmed)
+    }
+
     fn set_clipboard_read_allowed(&self, allow: bool) {
         use ghostty_config::types_b::ClipboardAccess;
         self.set_config_clipboard(

crates/ghostty-core/src/surface/mouse.rs

@@ -1664,7 +1664,7 @@ impl Surface {
                         sel: link.selection,
                         trim: false,
                     });
-                    let pwd = t.get_pwd().map(|p| String::from_utf8_lossy(p).into_owned());
+                    let pwd = t.get_pwd().map(ghostty_os::osbytes::bytes_to_config_string);
                     resolve_path_for_opening(pwd.as_deref(), &str).unwrap_or(str)
                 }