Move stdlib out of spec — clean spec/library boundary

spec/ now contains only the language definition (5 files):
  evaluator.sx, parser.sx, primitives.sx, render.sx, special-forms.sx

lib/ contains code written IN the language (8 files):
  stdlib.sx, types.sx, freeze.sx, content.sx,
  bytecode.sx, compiler.sx, vm.sx, callcc.sx

Test files follow source: spec/tests/ for core language tests,
lib/tests/ for library tests (continuations, freeze, types, vm).

Updated all consumers:
- JS/Python/OCaml bootstrappers: added lib/ to source search paths
- OCaml bridge: spec_dir for parser/render, lib_dir for compiler/freeze
- JS test runner: scans spec/tests/ (always) + lib/tests/ (--full)
- OCaml test runner: scans spec/tests/, lib tests via explicit request
- Docker dev mounts: added ./lib:/app/lib:ro

Tests: 1041 JS standard, 1322 JS full, 1101 OCaml — all pass

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.dev.yml

@@ -48,6 +48,7 @@ services:
       - ./shared:/app/shared
       - ./hosts/ocaml/_build/default/bin/sx_server.exe:/app/bin/sx_server:ro
       - ./spec:/app/spec:ro
+      - ./lib:/app/lib:ro
       - ./web:/app/web:ro
       - ./blog/alembic.ini:/app/blog/alembic.ini:ro
       - ./blog/alembic:/app/blog/alembic:ro
@@ -90,6 +91,7 @@ services:
       - ./shared:/app/shared
       - ./hosts/ocaml/_build/default/bin/sx_server.exe:/app/bin/sx_server:ro
       - ./spec:/app/spec:ro
+      - ./lib:/app/lib:ro
       - ./web:/app/web:ro
       - ./market/alembic.ini:/app/market/alembic.ini:ro
       - ./market/alembic:/app/market/alembic:ro
@@ -131,6 +133,7 @@ services:
       - ./shared:/app/shared
       - ./hosts/ocaml/_build/default/bin/sx_server.exe:/app/bin/sx_server:ro
       - ./spec:/app/spec:ro
+      - ./lib:/app/lib:ro
       - ./web:/app/web:ro
       - ./cart/alembic.ini:/app/cart/alembic.ini:ro
       - ./cart/alembic:/app/cart/alembic:ro
@@ -172,6 +175,7 @@ services:
       - ./shared:/app/shared
       - ./hosts/ocaml/_build/default/bin/sx_server.exe:/app/bin/sx_server:ro
       - ./spec:/app/spec:ro
+      - ./lib:/app/lib:ro
       - ./web:/app/web:ro
       - ./events/alembic.ini:/app/events/alembic.ini:ro
       - ./events/alembic:/app/events/alembic:ro
@@ -213,6 +217,7 @@ services:
       - ./shared:/app/shared
       - ./hosts/ocaml/_build/default/bin/sx_server.exe:/app/bin/sx_server:ro
       - ./spec:/app/spec:ro
+      - ./lib:/app/lib:ro
       - ./web:/app/web:ro
       - ./federation/alembic.ini:/app/federation/alembic.ini:ro
       - ./federation/alembic:/app/federation/alembic:ro
@@ -254,6 +259,7 @@ services:
       - ./shared:/app/shared
       - ./hosts/ocaml/_build/default/bin/sx_server.exe:/app/bin/sx_server:ro
       - ./spec:/app/spec:ro
+      - ./lib:/app/lib:ro
       - ./web:/app/web:ro
       - ./account/alembic.ini:/app/account/alembic.ini:ro
       - ./account/alembic:/app/account/alembic:ro
@@ -295,6 +301,7 @@ services:
       - ./shared:/app/shared
       - ./hosts/ocaml/_build/default/bin/sx_server.exe:/app/bin/sx_server:ro
       - ./spec:/app/spec:ro
+      - ./lib:/app/lib:ro
       - ./web:/app/web:ro
       - ./relations/alembic.ini:/app/relations/alembic.ini:ro
       - ./relations/alembic:/app/relations/alembic:ro
@@ -329,6 +336,7 @@ services:
       - ./shared:/app/shared
       - ./hosts/ocaml/_build/default/bin/sx_server.exe:/app/bin/sx_server:ro
       - ./spec:/app/spec:ro
+      - ./lib:/app/lib:ro
       - ./web:/app/web:ro
       - ./likes/alembic.ini:/app/likes/alembic.ini:ro
       - ./likes/alembic:/app/likes/alembic:ro
@@ -363,6 +371,7 @@ services:
       - ./shared:/app/shared
       - ./hosts/ocaml/_build/default/bin/sx_server.exe:/app/bin/sx_server:ro
       - ./spec:/app/spec:ro
+      - ./lib:/app/lib:ro
       - ./web:/app/web:ro
       - ./orders/alembic.ini:/app/orders/alembic.ini:ro
       - ./orders/alembic:/app/orders/alembic:ro
@@ -400,6 +409,7 @@ services:
       - ./shared:/app/shared
       - ./hosts/ocaml/_build/default/bin/sx_server.exe:/app/bin/sx_server:ro
       - ./spec:/app/spec:ro
+      - ./lib:/app/lib:ro
       - ./web:/app/web:ro
       - ./test/app.py:/app/app.py
       - ./test/sx:/app/sx
@@ -431,6 +441,7 @@ services:
       - ./shared:/app/shared
       - ./hosts/ocaml/_build/default/bin/sx_server.exe:/app/bin/sx_server:ro
       - ./spec:/app/spec:ro
+      - ./lib:/app/lib:ro
       - ./web:/app/web:ro
       - ./sx/app.py:/app/app.py
       - ./sx/sxc:/app/sxc
@@ -469,6 +480,7 @@ services:
       - ./shared:/app/shared
       - ./hosts/ocaml/_build/default/bin/sx_server.exe:/app/bin/sx_server:ro
       - ./spec:/app/spec:ro
+      - ./lib:/app/lib:ro
       - ./web:/app/web:ro
       - ./artdag/core:/app/artdag/core
       - ./artdag/l1/tests:/app/artdag/l1/tests
@@ -497,6 +509,7 @@ services:
       - ./shared:/app/shared
       - ./hosts/ocaml/_build/default/bin/sx_server.exe:/app/bin/sx_server:ro
       - ./spec:/app/spec:ro
+      - ./lib:/app/lib:ro
       - ./web:/app/web:ro
       - ./artdag:/app/artdag
     profiles: