Phase 7k: bytes(n) / words(n) allocators (retire mem_alloc)

Allocation reads as intent, not malloc:

  mem_alloc(64)          -> bytes(64)              (64 bytes -> a byte buffer)
  mem_alloc(w * h * 4)   -> words(w * h)           (w*h 32-bit words)

bytes(n) mallocs n bytes and returns a plain pointer (byte-indexed); words(n)
mallocs n*4 bytes and returns a `words` pointer (int-indexed). Since words(X) and
mem_alloc(X*4) allocate the identical number of bytes, the migration cannot change
any allocation size — the `* 4` factor just moves from the argument into the
allocator name, pairing naturally with the Phase-7j `words` retyping
(`var fb: words = words(w * h)`).

Migrated 102 sites (mem_alloc(E*4) -> words(E), else bytes(E)); deleted the
mem_alloc intrinsic. mem_realloc/free/copy/set stay as the low-level
reallocation/free family. Reseeded (22565 lines); C-free fixpoint holds; goldens
byte-identical; 18/18; vocab + doc-fences clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tools/editors/jetbrains/src/main/kotlin/io/ludic/ide/LudicTokens.kt

@@ -66,7 +66,7 @@ object LudicVocabulary {
         "ui_focused", "ui_visible", "key", "reg", "set_reg", "self", "save", "load",
         "status", "print", "str", "quit",
         // compiler intrinsics: the floor the Ludic-written runtime stands on
-        "mem_alloc", "mem_realloc", "mem_free", "mem_copy", "mem_set",         "os_argc", "os_arg", "file_stderr", "file_stdout",
+        "bytes", "words", "mem_realloc", "mem_free", "mem_copy", "mem_set",         "os_argc", "os_arg", "file_stderr", "file_stdout",
         "peekp", "pokep", "peekf", "pokef", "ptr_add",
         "as_fixed", "as_int", "file_open", "file_read", "file_write",
         "file_seek", "file_tell", "file_close", "read_byte", "write_byte",