feat(release): foundations for parse-confidence scoring

Add the building blocks for Phase A scoring without yet wiring them
into parse_release. Nothing changes at runtime — parse_release still
returns a single ParsedRelease — but the pieces needed to upgrade it
in a follow-up commit are now in place.

- alfred/knowledge/release/scoring.yaml: weights / penalties /
  thresholds. Title and media_type are heavy (30 / 20), structural
  fields medium (year 15, season 10), tech fields light (5 each).
  Unknown-token penalty 5 capped at -30. SHITTY/PoP cutoff at 60.
- load_scoring() loader with safe defaults baked in: a missing or
  partial YAML only de-tunes, never breaks.
- ReleaseKnowledge port grows a 'scoring: dict' field. YamlReleaseKnowledge
  populates it from load_scoring().
- New parser/scoring.py module with Road enum (EASY / SHITTY /
  PATH_OF_PAIN, distinct from ParsePath which records the tokenization
  route), and pure functions: compute_score, decide_road,
  collect_unknown_tokens, collect_missing_critical.
- ParseReport frozen VO in value_objects.py — exported alongside
  ParsedRelease.

alfred/domain/release/__init__.py

@@ -1,6 +1,6 @@
 """Release domain — release name parsing and naming conventions."""
 
 from .services import parse_release
-from .value_objects import ParsedRelease
+from .value_objects import ParsedRelease, ParseReport
 
-__all__ = ["ParsedRelease", "parse_release"]
+__all__ = ["ParsedRelease", "ParseReport", "parse_release"]