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

selfhost/, cmd/, internal/ join the tree-wide sweep: every section
banner dies (91 selfhost + the cmd C-style dividers -> 0); narration
and stale contracts deleted (pre-#22 bundler notes, retired
single-PT_LOAD and no-archive claims, superseded ABI tables); every
ref/harec/qbe cite, task cite, encoding/ELF contract, and rule-10
twin pointer kept; lost lifetime/rationale lines restored where the
sweep over-cut (elf_globals ownership, kwtab linear-scan). Comment-
only proven: all five wwstage tool binaries byte-identical across
the sweep; test-commit, test-byteid (161+1399, 0 pinned-divergent),
and test-bootstrap (fixed point + 991-995 byte-id) all exit 0.
The read-through banked 66 latent-bug leads (checkpoint).

selfhost/cmd/w6l/pass.ww

@@ -1,11 +1,4 @@
-// selfhost/cmd/w6l/pass.ww — port of cmd/w6l/pass.c.
-//
-// Resolution + relocation. l_resolve flags every undefined symbol
-// referenced by a relocation, and promotes those provided by some
-// loaded .so to "dynamic" with a freshly-assigned PLT slot.
-// l_relocate walks the rel list and patches the .text bytes in place
-// once the final virtual base is known. Dynamic refs are deferred:
-// their site is patched later in dynout, once the PLT vaddr is known.
+// Port of cmd/w6l/pass.c.
 //
 // Supported relocation kinds: PC32 (=2), PLT32 (=4); both are 32-bit
 // PC-relative displacements (PLT32 == PC32 for static).