wcc+ww: //ww:module-reset boundary directive; package-less files keep module "" (#16 PREP-main)

Driver twins emit the line-comment directive only before package-less
files (peekpackage==nil); both lexers tokenize it (TK_MODRESET, appended
=87 so existing token values hold) and both parsers reset curmod — a
package-less file's decls get module "" instead of inheriting the last
bundled package (the sticky-curmod leak, task #11). Withdrawn
alternative: injecting 'package main' flips non-entry symbols
bare->main-prefixed (FFI-visible, broke 764). Codegen-neutral by proof:
bare symbols preserved, both stages emit byte-identical asm for a
directive-bearing combined. Transitional until strict-package rejects
package-less files outright. Includes 737 bad-deep pin for the
PREP-peek >2048 edge + 904/toktest rows for the new token.

test/wcc/data/direnum/bad_deep_entry.ww

@@ -0,0 +1,5 @@
+package main;
+
+import bad_deep_pkg;
+
+export fn main() i32 = { return 0; };

test/wcc/data/direnum/bad_deep_pkg/a.ww

@@ -0,0 +1,3 @@
+package alpha;
+
+fn aaa() i32 = { return 1; };

test/wcc/data/direnum/bad_deep_pkg/b.ww

@@ -0,0 +1,54 @@
+// b.ww — #16 PREP-main peek-edge pin (reviewer-batcha).
+// This file's `package beta;` decl sits behind a comment header
+// longer than 2048 bytes ON PURPOSE: the old wwstage peekpackage
+// capped its read at 2048 bytes and would MISS the package decl
+// (return nil), so the strict-same-package dir-enum check would
+// skip this file and the alpha/beta mismatch would go undetected
+// (build wrongly succeeds). The PREP-peek whole-file read finds
+// `package beta;`, so the mismatch fires 'differs from' and the
+// build fails — which is what 737's bad_deep family asserts on
+// both stages. Do not shorten this header below 2048 bytes.
+//
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+// padding line to push the package decl past the 2048-byte peek window.
+package beta;
+
+fn bbb() i32 = { return 2; };