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 Withdrawn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/737_direnum.c

@@ -133,6 +133,46 @@ main(void)
 		}
 	}
 
+	/* bad-deep: same mismatch, but one file's `package` decl sits behind
+	 * a >2048-byte comment header. Pins the PREP-peek whole-file read
+	 * (#16): the old 2048-capped peek missed that decl, so the strict-
+	 * same-package check skipped the file and the mismatch went
+	 * undetected (build wrongly succeeded); the whole-file peek finds it
+	 * → "differs from". Both stages. (reviewer-batcha pin.) */
+	{
+		const char *src = "test/wcc/data/direnum/bad_deep_entry.ww";
+		snprintf(errp, sizeof errp, "/tmp/direnum_%d_baddeep.err", getpid());
+
+		char cmd[2048];
+		snprintf(cmd, sizeof cmd, "%s build %s 2>%s >/dev/null",
+		    ww, src, errp);
+		int rc = runwait(cmd);
+		total++;
+		if (rc == 0) {
+			fprintf(stderr, "737[bad-deep-cstage]: expected build failure, succeeded\n");
+			fail++;
+		} else if (!stderr_contains(errp, "differs from")) {
+			fprintf(stderr, "737[bad-deep-cstage]: stderr missing 'differs from'\n");
+			fail++;
+		}
+		unlink(errp);
+
+		if (access(ww_ww, X_OK) == 0) {
+			snprintf(cmd, sizeof cmd, "%s build %s 2>%s >/dev/null",
+			    ww_ww, src, errp);
+			rc = runwait(cmd);
+			total++;
+			if (rc == 0) {
+				fprintf(stderr, "737[bad-deep-wwstage]: expected build failure, succeeded\n");
+				fail++;
+			} else if (!stderr_contains(errp, "differs from")) {
+				fprintf(stderr, "737[bad-deep-wwstage]: stderr missing 'differs from'\n");
+				fail++;
+			}
+			unlink(errp);
+		}
+	}
+
 	if (fail) {
 		fprintf(stderr, "737_direnum: %d/%d fixtures failed\n", fail, total);
 		return 1;

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; };