feat(scoring): add language-specific causes of death

Closes #10.

Extends determineCauseOfDeath() with 7 new language-specific rules
beyond the existing JavaScript one:

- PHP → Died of PHP fatigue
- Ruby → Gemfile.lock never unlocked
- Python → Pip froze, then everything else did
- Perl → Nobody could read it, including the author
- CoffeeScript → Outlived by the thing it inspired
- Objective-C → Swift happened
- Scala → Compilation finished, interest did not

Language-specific rules follow the existing isJS pattern: score 5 when
the repo's primary language matches and daysSince > 365 (except
CoffeeScript, which is punished on language alone because it's dead by
definition).

Existing 32 tests still pass; no rule changes to the universal
checks.

Author: mvanhorn

src/lib/scoring.ts

@@ -92,6 +92,34 @@ export function determineCauseOfDeath(repo: RepoData): string {
       score: isJS && daysSince > 365 ? 5 : 0,
       cause: 'Lost in dependency hell',
     },
+    {
+      score: repo.language?.toLowerCase() === 'php' && daysSince > 365 ? 5 : 0,
+      cause: 'Died of PHP fatigue',
+    },
+    {
+      score: repo.language?.toLowerCase() === 'ruby' && daysSince > 365 ? 5 : 0,
+      cause: 'Gemfile.lock never unlocked',
+    },
+    {
+      score: repo.language?.toLowerCase() === 'python' && daysSince > 365 ? 5 : 0,
+      cause: 'Pip froze, then everything else did',
+    },
+    {
+      score: repo.language?.toLowerCase() === 'perl' && daysSince > 365 ? 5 : 0,
+      cause: 'Nobody could read it, including the author',
+    },
+    {
+      score: repo.language?.toLowerCase() === 'coffeescript' ? 5 : 0,
+      cause: 'Outlived by the thing it inspired',
+    },
+    {
+      score: repo.language?.toLowerCase() === 'objective-c' && daysSince > 365 ? 5 : 0,
+      cause: 'Swift happened',
+    },
+    {
+      score: repo.language?.toLowerCase() === 'scala' && daysSince > 365 ? 5 : 0,
+      cause: 'Compilation finished, interest did not',
+    },
     {
       score: descLower.includes('microservice') || descLower.includes('enterprise') ? 5 : 0,
       cause: 'Killed by overengineering',