Add PAPER_OUTLINE.md: §1-§6 draft reflecting round 17 + 18

Comprehensive paper draft outline for the NeurIPS 2026 E&D submission:

§1 Discovery-first hook (round 16 narrative arc): broken eval -> evidence
   -> metrics miss -> need protocol -> validation
§2 Audit findings: 5-method × 3-seed audit, walk-back details, EP internal
   control
§3 The diagnostic protocol: 4 diagnostics, decision-utility ablation,
   threshold sensitivity (with (d) fragility flagged), temporal validation,
   cross-architecture validation, sub-mode discrimination
§4 Two failure modes: mechanism story + causal penalty rescue, with the
   round 18 softening (partial dissociation rather than full separability)
§5 Pipeline pitfalls catalog: 7 bugs (incl. new #6.5 self-cosine fallback)
§6 Reference implementation
+ Limitations / walk-backs section listing all 5 walked-back claims explicitly

This is a working draft to make the next writing step concrete. Reflects
all evidence collected through the round 18 follow-up.

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