paper: framed code blocks, real AntiPaSTO cite, leave-one-out ablation

Formatting pass lifted from the AntiPaSTO paper (the format the author is
happy with):
- verbatim -> lstlisting (framed, shaded, Python-highlighted code blocks;
  chat-template prompt uses language={} so markup isn't keyword-coloured)
- xcolor[table] + \rowcolor highlight on the 'ours' rows (keynote, ablation)
- ablation table restructured as leave-one-out with the negate symbol
  (negate-routing/directional/hack-pairs/intervention); long interpretation
  moved out of the caption into section body; post-hoc split into its own block
- real AntiPaSTO citation (Clark 2026, arXiv:2601.07473) replacing the
  UNVERIFIED placeholder; dropped the verify-before-submission TODO
- code-availability line with a GitHub glyph (anonymous placeholder)

Builds clean: 11 pages, no unresolved refs/cites.

Co-Authored-By: Claudypoo <288921227+claudypoo@users.noreply.github.com>

docs/writeup/refs.bib

@@ -61,14 +61,16 @@
   url          = {https://arxiv.org/abs/2406.11717}
 }
 
-% The prior paired-preference SVD-basis steering work this builds on.
-% TODO: no verifiable citation on hand. Fill title/venue/url/year before use,
-% or drop. Do NOT invent fields.
+% The prior SVD-basis steering work this builds on (same author; the per-Linear
+% delta_S adapter originates here). arXiv id supplied by the author 2026-06-03.
 @misc{antipasto,
-  title        = {AntiPaSTO},
-  author       = {TODO},
-  year         = {TODO},
-  note         = {UNVERIFIED -- fill or remove before submission}
+  title        = {AntiPaSTO: Self-Supervised Honesty Steering via Anti-Parallel Representations},
+  author       = {Clark, Michael J.},
+  year         = {2026},
+  eprint       = {2601.07473},
+  archivePrefix= {arXiv},
+  primaryClass = {cs.LG},
+  url          = {https://arxiv.org/abs/2601.07473}
 }
 
 % --- gradient-routing / projection related work --------------------------