fix(release/parser): collapse chained multi-episode markers to full range

S14E09E10E11 previously parsed to episode=9, episode_end=10 — E11
was silently dropped. The parser now takes episodes[-1] as
episode_end so the full chain is captured (episode=9, episode_end=11).
Intermediate values stay implied.

Fixture shitty/archer_multi_episode/ updated from anti-regression of
the bug to anti-regression of the fix.

CHANGELOG.md

@@ -15,6 +15,15 @@ callers).
 
 ## [Unreleased]
 
+### Fixed
+
+- **Multi-episode chain (e.g. `S14E09E10E11`) now collapses to a full
+  range.** The parser previously captured `episode=9, episode_end=10`
+  and dropped E11+. It now returns `episode=first, episode_end=last`,
+  with intermediate values implied. Fixture
+  `shitty/archer_multi_episode/` updated from anti-regression-of-bug
+  to anti-regression-of-fix.
+
 ### Added
 
 - **`LanguageRepository` port** in `alfred.domain.shared.ports`. Structural