lib: banner purge + WHY-only comment sweep (rule 8)

Every // ---- section banner dies (132 -> 0): names carry the WHAT.
Narration deleted (filename restatements, run-with lines, what-the-
next-line-does); every ref/hare cite, task cite, divergence, ABI/
layout contract, and ownership qualifier kept (borrowed-view lines
restored where the sweep over-cut). Comment-only proven: all 442
walk-workdir .s and 32 import-probe .s byte-identical before/after;
libbyteid 56-roster all-ID.

lib/bytes/tokenize_test.ww

@@ -1,6 +1,4 @@
-// tokenizetest — exercises the bytes tokenize/splitn/cut families.
-// A failing row aborts via the assert/abort builtin (task #5 @test
-// conversion). Vectors mirror ref/hare/bytes/tokenize.ha.
+// Vectors mirror ref/hare/bytes/tokenize.ha (task #5 @test conversion).
 
 package bytes_test;
 
@@ -11,8 +9,6 @@ import os;
 // drives the iterator through an expected-token sequence and asserts
 // `equal(p, n)` (peek == next), `equal(n, want)` (next == expected).
 
-// expect_token — table row driver. Advances `t` once, asserts the
-// returned token matches `want`. peek invariant: peek must equal next.
 fn expect_token(t: *bytes.tokenizer, want: []u8) void = {
 	match (bytes.peektoken(t)) {
 	case let p: []u8 => {
@@ -28,7 +24,6 @@ fn expect_token(t: *bytes.tokenizer, want: []u8) void = {
 	};
 };
 
-// expect_done — table-row driver. peek and next must both be done.
 fn expect_done(t: *bytes.tokenizer) void = {
 	match (bytes.peektoken(t)) {
 	case let p: []u8 => abort();