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V3.96: mixed-precision ArXiv paper prep and UNUM2 number system (#506)

* Incrementing SEMVER to v3.96.1

* Fix UBSan: guard negative exponent overflow in areal conversion

When exponent is a large negative (e.g. -72), the shift `1ull << -exponent`
exceeds 63 bits, causing undefined behavior. Add `exponent > -64` guard
so both positive and negative extremes fall through to the safe ipow() path.

* weird difference between double and duble

* systems and position paper roadmaps

* Add papers/ artifact tree with three mixed-precision solver case studies

Create self-contained papers/ directory for systems and position paper
artifacts that can be zipped and shared with reviewers:

- papers/systems-paper/iterative_refinement.cpp: Carson & Higham
  three-precision LU-IR across IEEE, posit, cfloat, dd, cross-family
- papers/systems-paper/conjugate_gradient.cpp: CG for SPD systems with
  single-precision and two-precision (low preconditioner) configurations
- papers/systems-paper/idrs.cpp: IDR(s) for non-symmetric systems with
  shadow space dimension sweep and number system comparison

Move paper docs from docs/papers/ to papers/docs/ for co-location.
Add UNIVERSAL_BUILD_PAPERS CMake option (wired into BUILD_ALL cascade).

* Add changelog and session doc for paper artifact tree and solver studies

* Add LaTeX scaffolding for arXiv systems paper

Plain article class (12pt) with full section structure, TODO placeholders,
29 BibTeX references (14 from JOSS + 15 new), and Makefile for local builds.

* Add changelog and session doc for LaTeX paper scaffolding

* arxiv paper first draft

* arxiv systems paper draft v3

* Adding a mixed-precision Attention head with KV cache test case for the ArXiv paper

* Complete posit2 arithmetic, conversion, logic, and assignment test suites

Add all four arithmetic operations (sub, mul, div plus existing add) via
blocktriple pipeline, port conversion/assignment/logic regression tests
from original posit, and fix three bugs d... (continued)

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