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/endian/network.ww

@@ -1,7 +1,7 @@
-// endian — byte-order conversions. Mirrors Hare's endian:: surface:
-// big-endian (be*), little-endian (le*), and network-order (hton/ntoh)
-// helpers. Host order on amd64 is little-endian, so hton/ntoh are
-// byte swaps and the le* family is identity.
+// Mirrors Hare's endian:: surface: big-endian (be*), little-endian
+// (le*), and network-order (hton/ntoh) helpers. Host order on amd64 is
+// little-endian, so hton/ntoh are byte swaps and the le* family is
+// identity.
 
 package endian;