📚 Document int?/integer? predicate coverage in Clojure memory

Review assumed int? was 32-bit; it covers Long/Integer/Short/Byte.
Note it in mem:clojure/idioms so the mistake is not repeated.

AI-assisted-by: muse-spark-1.3-contributor

.serena/memories/clojure/idioms.md

@@ -0,0 +1,10 @@
+# Clojure Idioms (verified)
+
+Behaviors confirmed against the language/stdlib — do not re-derive from
+assumption; a wrong assumption here already cost a review round.
+
+- `int?` is NOT 32-bit-only: true for `Long`, `Integer`, `Short`,
+  `Byte` (fixed-precision integers). Clojure integer literals are
+  `Long`, so `(int? 5000)` is true.
+- `integer?` is the general integer predicate; prefer it when any
+  integer kind must match, `int?` only when fixed precision is meant.

.serena/memories/critical-info.md

@@ -7,6 +7,9 @@ You are working on the GitHub project `penpot/penpot`, a monorepo.
    before focused memories.
 - Edits/stale refs/duplication cleanup: `mem:memory-maintenance`.
 - Cross-cutting testing principles, TDD workflow, and anti-patterns: `mem:testing`.
+- Verified Clojure language behaviors that contradict common assumptions
+  (e.g. `int?` covers `Long`; `integer?` is the general predicate):
+  `mem:clojure/idioms` — read before assuming stdlib predicate semantics.
 
 # Development workflow