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/shlex/shlex.ww

@@ -2,14 +2,6 @@
 // (ref/hare/shlex/{split.ha,escape.ha}) using ww byte-indexed cursors
 // in place of Hare's strings::iterator.
 //
-// Surface today:
-//
-//   shlex.syntaxerr            — !void; bad shell syntax
-//   shlex.strerror(syntaxerr)  — "Invalid shell syntax"
-//   shlex.split(in: str)       — tokenize; returns ([]str | syntaxerr)
-//   shlex.quote(io.stream, s)  — write `s` shell-quoted to a sink
-//   shlex.quotestr(s: str) str — quote into a fresh str
-//
 // Owning model: split() returns a fresh `[]str` of strings.dup'd
 // elements; release with [[strings.freeall]] (Hare's natural disposer
 // shape). quotestr() returns an os.alloc'd str; release via
@@ -227,7 +219,6 @@ export fn split(in: str) ([]str | syntaxerr) = {
 		dirty = true;
 
 		if (r == ' ' || r == '\t' || r == '\n') {
-			// Collapse a run of whitespace.
 			let inner: bool = true;
 			for (inner) {
 				if (pos >= in.len) { inner = false; }