feat(core): score season packs per episode

A size band describes one episode (DESIGN.md §5.5), so both the target
penalty and the floor now compare a release's size divided by the number
of episodes it covers. The caller supplies the count — arr-core has no
IO. Movies and unknown counts divide by one, so movie scoring is
unchanged and pinned by test.

Closes #180

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/arr-daemon/src/import.rs

@@ -307,6 +307,7 @@ impl ImportAction {
             &original_language,
             Candidate::PostDownload(&feature.media),
             Some(feature.size),
+            1,
         );
         let waiver: Option<Rule> = match evaluation.verdict {
             Verdict::Rejected(rule) => {
@@ -494,6 +495,7 @@ impl ImportAction {
                 &original_language,
                 Candidate::PostDownload(&assignment.file.media),
                 Some(assignment.file.size),
+                1,
             );
             let waiver = match evaluation.verdict {
                 Verdict::Rejected(rule) => {