Step 5 fix: trampoline core-renames + 20-coll paren balance

Add "trampoline" "core-trampoline" to core-renames so compile
mode emits direct calls. Without this entry the compiler falls
back to resolving trampoline in Clojure namespace, which fails
since trampoline was removed from overlay.

Fix 20-coll.clj extra close paren from trampoline removal.

src/jolt/compiler.janet

@@ -98,6 +98,7 @@
     "drop-while" "core-drop-while"
     "nth" "core-nth"
     "mapcat" "core-mapcat"
+    "trampoline" "core-trampoline"
     "list" "core-list"
     "name" "core-name"
     "subs" "core-subs"