Phase 5: HAMT Persistent Map + Persistent Set, 86 tests pass

- T5.3: HAMT Persistent Map (lib/cljnim_pmap.nim)
  O(log32 n) assoc/dissoc/get with structural sharing
  16 unit tests, ckMap migrated from seq to HAMT

- T5.4: Persistent Set backed by HAMT map
  ckSet with conj/disj/contains?/get, set literal #{}

- Fix: cljContains/cljCount return CljVal (not bool/int)
- Fix: equality in generics via explicit cljEq parameter
- Updated roadmap, task board, CI/Makefile

docs/ROADMAP.md

@@ -46,19 +46,19 @@
 
 ## Phase 5: Persistent Data Structures
 - [x] Persistent Vector (Hash Array Mapped Trie, 32-way branching)
-- [ ] Persistent Map (HAMT)
-- [ ] Persistent Set
+- [x] Persistent Map (HAMT) — `pmapAssoc`, `pmapDissoc`, `pmapGet` in O(log₃₂ n)
+- [x] Persistent Set — backed by HAMT map, `conj`/`disj`/`contains?`/`get`
 - [x] `conj`, `assoc`, `dissoc`, `get`, `get-in`
 - [x] `nth`, `first`, `rest`, `last`, `count` on persistent collections
 - [ ] Transients for batch mutations
 
 ## Phase 6: Clojure Core Library
 - [ ] `range`, `repeat`, `cycle`, `iterate`
-- [ ] `take`, `drop`, `partition`, `interleave`, `concat`
-- [ ] `str`, `pr-str`, `println`, `prn`
+- [x] `take`, `drop`, `partition`, `interleave`, `concat`
+- [x] `str`, `pr-str`, `println`, `prn`
 - [ ] `slurp`, `spit`, `read-line`
 - [ ] `meta`, `with-meta`, `vary-meta`
-- [ ] `type`, `instance?`, `satisfies?`
+- [x] `type`, `instance?`, `satisfies?`
 
 ## Phase 7: Project Compilation
 - [ ] Compile entire projects (not just single files)
@@ -79,4 +79,3 @@
 ## Known Issues
 - `->>` threading macro with nested `map`/`reduce` requires proper macro expansion context
 - REPL definitions are re-compiled from scratch on each evaluation (slow but correct)
-- No true persistent data structures yet (runtime uses Nim seq/tables)