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/builder/bin.rs

@@ -18,7 +18,7 @@ pub fn build(
     _cross: Option<&CrossConfig>,
     _export_compiler_flags: bool,
 ) -> Result<()> {
-    println!(
+    crate::log_info!(
         "Binary install: copying files from {} to {} (pkg type={})",
         src_dir.display(),
         destdir.display(),
@@ -87,6 +87,8 @@ mod tests {
                 flags: BuildFlags::default(),
             },
             dependencies: Dependencies::default(),
+            package_alternatives: Default::default(),
+            package_dependencies: Default::default(),
             spec_dir: std::path::PathBuf::from("."),
         }
     }