fix: preserve non-UTF-8 bytes in OS, config and CLI layers

Zig treats paths, arguments and environment values as byte slices; the
port converted them lossily in many places. Now (final-Z1.md):
- argv, env (incl. present non-UTF-8 values), HOME, PATH lookup,
  passwd, resources dir, TMPDIR, cgroup, config path canonicalization,
  +validate-config, +list-themes and Zig-string escapes (\xFF) keep raw
  bytes. String-based config values carry bytes via ghostty_os::osbytes,
  a bijective escape (noncharacter U+FDD0 + byte) that leaves all valid
  UTF-8 - including Nerd Font private-use icons - unchanged.
- os/file rlimit fallbacks exist on all targets.
- i18n locale canonicalization is an exact port of libintl's tables
  (e.g. pa-Guru -> pa_IN).
- New ghostty-build-info crate is the single source of version, channel,
  commit and build mode for all consumers.

Test Plan:
- cargo test -p ghostty-os -p ghostty-config -p ghostty-cli
  (incl. randomized osbytes round-trip property tests)

crates/ghostty-cli/src/new_window.rs

@@ -59,11 +59,12 @@ impl Options {
             let expanded =
                 ghostty_os::expand_home(stripped).map_err(|e| ArgError::Other(e.to_string()))?;
             let realpath =
-                std::fs::canonicalize(&expanded).map_err(|e| ArgError::Other(e.to_string()))?;
+                std::fs::canonicalize(ghostty_os::osbytes::config_str_to_path(&expanded))
+                    .map_err(|e| ArgError::Other(e.to_string()))?;
             self.working_directory_seen = true;
             return Ok(Some(format!(
                 "--working-directory={}",
-                realpath.to_string_lossy()
+                ghostty_os::osbytes::path_to_config_string(&realpath)
             )));
         }
 
@@ -192,8 +193,13 @@ pub fn run(args: &[String]) -> Result<u8, Error> {
     if !opts.working_directory_seen {
         // This should be inserted at the beginning of the list, just in case `-e` was used.
         let wd = std::fs::canonicalize(".")?;
-        opts.arguments
-            .insert(0, format!("--working-directory={}", wd.to_string_lossy()));
+        opts.arguments.insert(
+            0,
+            format!(
+                "--working-directory={}",
+                ghostty_os::osbytes::path_to_config_string(&wd)
+            ),
+        );
     }
 
     let target = match opts.class {