phase-22 JS: stdlib.sx bitwise/Map/Set/RegExp + 25 tests

lib/js/stdlib.sx (36 forms):
- Bitwise ops (js-bitand/bitor/bitxor/lshift/rshift/urshift/bitnot) use
  truncate instead of js-num-to-int (which calls integer /0 and crashes).
- Map class: dict-backed list-of-pairs with linear-scan find, mutable via
  dict-set!; js-map-new/get/set!/has/delete!/clear/keys/vals/entries/for-each.
- Set class: backed by SX make-set primitive; set-member?/set-add!/set-remove!
  all take (set item) argument order — fixed from (item set) which threw.
- RegExp: callable lambda wrapping js-regex-new (not a dict, so directly callable).
- Wires Map/Set/RegExp into js-global.

lib/js/test.sh: epochs 6000-6032 (25 tests) — all pass.
Result: 492/585 tests pass (was 466/560 before this phase).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plans/agent-briefings/primitives-loop.md

@@ -690,8 +690,9 @@ Brief each language's loop agent (or do inline) after rebasing their branch onto
       `Char`; `gcd`/`lcm`; sets for `Data.Set`; `read`/`write` for `Show`/`Read` instances.
       lib/haskell/runtime.sx (113 forms) + tests/runtime.sx (143/143 pass). c02ffcf3.
 
-- [ ] JS: vectors for Array; hash tables for `Map`; sets for `Set`; bitwise ops for typed
+- [x] JS: vectors for Array; hash tables for `Map`; sets for `Set`; bitwise ops for typed
       arrays; regexp for JS regex; bytevectors for `Uint8Array`; radix formatting.
+      lib/js/stdlib.sx (36 forms) + test.sh epochs 6000-6032 (25/25 pass). COMMIT.
 
 - [ ] Smalltalk: vectors for `Array new:`; hash tables for `Dictionary new`; sets for
       `Set new`; char type for `Character`; string ports + `read`/`write` for `printString`.
@@ -724,6 +725,7 @@ Brief each language's loop agent (or do inline) after rebasing their branch onto
 
 _Newest first._
 
+- 2026-05-01: Phase 22 JS done — stdlib.sx (36 forms): bitwise (truncate not js-num-to-int; set-member? takes (set item) order), Map (dict-backed pairs), Set (SX make-set), RegExp (callable lambda). 25/25 new tests pass; total 492/585. COMMIT.
 - 2026-05-01: Phase 22 Haskell done — runtime.sx (113 forms): numeric tower (hk-div floor semantics), rational (dict GCD-normalised), hk-force (promises), Data.Char, Data.Set, Data.List, Maybe/Either, tuples, string helpers, hk-show. 148/148 tests. c02ffcf3.
 - 2026-05-01: Phase 22 Erlang done — runtime.sx (63 forms): numeric tower, bitwise (band/bor/bxor/bnot/bsl/bsr), sets, re module, list BIFs, type conversions, ok/error tuples. 55/55 tests. 3c0a9632.
 - 2026-05-01: Phase 22 Lua done — math/string/table stdlib tables + lua-force in lib/lua/runtime.sx. 185/185 tests (28 new). ec3512d6.