refactor: resolve cross-crate integration TODOs and resources discovery

Cleanup pass over items collected in docs/rewrite/INTEGRATION_TODO.md:
- OSC 133 printf-q / percent decoders live once in
  ghostty_vt::string_encoding; ghostty-os re-exports them.
- CursorStyle and clipboard codepoint map entries have one definition
  (ghostty-terminal); ghostty-config now depends on ghostty-terminal.
- ActionKey::docs() trailing blank lines fixed at the source; cli's
  workaround removed (+list-actions --docs still byte-identical).
- x11_color exposes names in original case; cli no longer re-parses
  rgb.txt.
- One cgroup scope wait loop (ghostty_os::cgroup::wait_for_scope).
- Flatpak passwd lookup implemented in ghostty-os via a local pty.
- +version shows the rustc version captured at build time.

Resources: dev builds find <workspace>/resources automatically (keeping
Ghostty's sentinel-file detection and GHOSTTY_RESOURCES_DIR);
scripts/gen-terminfo.sh (just terminfo) regenerates the compiled
terminfo; `just install [PREFIX]` installs binary, share/ghostty,
terminfo, desktop/D-Bus/systemd/metainfo files and icons.

Test Plan:
- cargo test for vt, os, config, input, cli
- diff `+list-keybinds`, `+list-actions --docs`, `+show-config --default`
  against /usr/bin/ghostty

crates/ghostty-input/src/binding/set.rs

@@ -9,8 +9,9 @@ use indexmap::IndexMap;
 use super::{Action, Elem, Error, Flags, FoldedTrigger, Parser, Trigger, TriggerKey};
 use crate::key::KeyEvent;
 
-/// TODO(integration): stand-in for `config/formatter.zig` `EntryFormatter`.
-/// The config crate implements this to write `keybind = <value>` lines.
+/// Sink for `config/formatter.zig` `EntryFormatter`. The config crate
+/// implements this (`ghostty_config::keybinds`) to write `keybind = <value>`
+/// lines.
 pub trait EntryFormatter {
     /// Format a single `key = value` entry where `value` is a string.
     fn format_entry(&mut self, value: &str);