feat: improve depot UX and packaging workflow

- add shared terminal UI helpers for colored info/warn/success logs and yes/no prompts
- add Python build backend (PEP 517/setup.py wheel build + install) and expose python in interactive spec creation
- expand spec/build flags (post_configure, make phase targets/dirs, configure_file, no_strip, no_compress_man)
- support split-output staging with internal .depot output dirs, shell helpers (haul/subdestdir), and per-output deps/provides overrides
- improve staging with ELF auto-strip and zstd manpage compression (with opt-out flags)
- enforce runtime deps before install and support legacy lifecycle hook script names
- improve manual source handling with files/urls lists and stricter validation

src/cross.rs

@@ -57,12 +57,12 @@ impl CrossConfig {
         let readelf = find_tool(prefix, &["readelf", "llvm-readelf"], false)
             .unwrap_or_else(|_| format!("{}-readelf", prefix));
 
-        println!("Cross-compilation tools discovered:");
-        println!("  CC:      {}", cc);
-        println!("  CXX:     {}", cxx);
-        println!("  AR:      {}", ar);
-        println!("  RANLIB:  {}", ranlib);
-        println!("  STRIP:   {}", strip);
+        crate::log_info!("Cross-compilation tools discovered:");
+        crate::log_info!("  CC:      {}", cc);
+        crate::log_info!("  CXX:     {}", cxx);
+        crate::log_info!("  AR:      {}", ar);
+        crate::log_info!("  RANLIB:  {}", ranlib);
+        crate::log_info!("  STRIP:   {}", strip);
 
         Ok(Self {
             prefix: prefix.to_string(),