refactor(config): parse config values from raw bytes like Zig

Zig parses config values (cli/args.zig, Config.zig field parsers,
config/string.zig) from raw byte slices, and each field type decides
whether it requires UTF-8 (InvalidValue otherwise) or stores bytes. The
port escape-encoded raw bytes into Strings at the line reader and let
fields parse the escaped text, so fields could observe encoding
artifacts; successive audits kept finding such leaks (RV5-RV8).

Field parsers now receive the original bytes: text fields validate UTF-8
where Zig does, byte/path fields store bytes (EncodedOs/OsString). This
resolves all 9 RV8 findings (docs/rewrite/notes/review-rv8-codex.md),
each with a regression test: Windows path conversion fails with
BadPathName instead of substituting U+FFFD; Windows process launch uses
strict UTF-8 like Zig's Command; the WTF-8 decoder accepts paired-
surrogate encodings like Zig; literal U+FDD0 Unicode key triggers;
selection-word-chars and clipboard-codepoint-map reject invalid UTF-8;
font style / codepoint-map family names use original bytes; C title
actions forward bytes; D-Bus new-window/Flatpak conversions match Zig.
Design, sweep and validation: docs/rewrite/notes/final-bytes-refactor.md.

Also moves the bundled iTerm2-Color-Schemes license out of
resources/themes/ so +list-themes no longer lists it as a theme
(output is now byte-identical to Ghostty 1.3.1).

Done by Codex (gpt-6-astra), reviewed and verified by the orchestrator.

Test Plan:
- cargo test --workspace --no-fail-fast (3428 passed, exit 0)
- just check-macos (both), just check-windows, just check-wasm
- +show-config --default --docs, +list-keybinds, +list-actions --docs,
  +list-themes --plain compared with /usr/bin/ghostty

crates/ghostty-font/src/shared_grid_set.rs

@@ -251,7 +251,9 @@ impl SharedGridSet {
 
                     log::warn!(
                         "font-family {style:?} not found: {}",
-                        desc.family.as_deref().unwrap_or("")
+                        desc.family
+                            .as_ref()
+                            .map_or("", ghostty_os::osbytes::EncodedOs::as_encoded)
                     );
                 }
             }
@@ -501,8 +503,8 @@ impl Key {
         let mut descriptors: Vec<Descriptor> = Vec::new();
         for family in &config.font_family.list {
             descriptors.push(Descriptor {
-                family: Some(ghostty_os::osbytes::config_str_to_text(family)),
-                style: config.font_style.name_value().map(str::to_string),
+                family: Some(family.clone()),
+                style: config.font_style.name_value().cloned(),
                 size: font_size.points,
                 variations: config.font_variation.list.clone(),
                 ..Descriptor::default()
@@ -518,9 +520,9 @@ impl Key {
         // no results would be found if we restrict to ALSO searching for
         // italic.
         for family in &config.font_family_bold.list {
-            let style = config.font_style_bold.name_value().map(str::to_string);
+            let style = config.font_style_bold.name_value().cloned();
             descriptors.push(Descriptor {
-                family: Some(ghostty_os::osbytes::config_str_to_text(family)),
+                family: Some(family.clone()),
                 bold: style.is_none(),
                 style,
                 size: font_size.points,
@@ -529,9 +531,9 @@ impl Key {
             });
         }
         for family in &config.font_family_italic.list {
-            let style = config.font_style_italic.name_value().map(str::to_string);
+            let style = config.font_style_italic.name_value().cloned();
             descriptors.push(Descriptor {
-                family: Some(ghostty_os::osbytes::config_str_to_text(family)),
+                family: Some(family.clone()),
                 italic: style.is_none(),
                 style,
                 size: font_size.points,
@@ -540,12 +542,9 @@ impl Key {
             });
         }
         for family in &config.font_family_bold_italic.list {
-            let style = config
-                .font_style_bold_italic
-                .name_value()
-                .map(str::to_string);
+            let style = config.font_style_bold_italic.name_value().cloned();
             descriptors.push(Descriptor {
-                family: Some(ghostty_os::osbytes::config_str_to_text(family)),
+                family: Some(family.clone()),
                 bold: style.is_none(),
                 italic: style.is_none(),
                 style,