Fix #100: strip lines before parsing with Requirement()

packaging 26.3 made requirement parsing strict: a trailing newline now
raises InvalidRequirement. process_line() parsed the raw line straight
from file iteration, the error was silently swallowed, and source
packages stayed pinned in the generated constraints.

Parse the stripped line instead, and log unparseable lines at debug
level so parser-behavior changes surface under -v instead of silently
producing downstream resolver errors.

Author: jensens

src/mxdev/processing.py

@@ -122,9 +122,9 @@ def process_line(
             cache_dir=cache_dir,
         )
     try:
-        parsed = Requirement(line)
+        parsed = Requirement(line.strip())
     except Exception:
-        pass
+        logger.debug(f"Line is not a requirement specifier: {line.strip()!r}")
     else:
         parsed_name_lower = parsed.name.lower()
         if parsed_name_lower in [k.lower() for k in package_keys]: