docs: JOSS paper for PyAutoLens-Assistant

[Jammy2211]

Summary

Adds paper/ — the JOSS manuscript for PyAutoLens-Assistant: Using Natural Language and AI to Analyse Gravitational Lenses — hosted with the software it describes, mirroring the PyAutoLens-JAX sibling in PyAutoLens/paper_jax/.

The drafted prose previously lived only in the PyAutoMind prompt file. This consolidates it into a real manuscript:

• paper/paper.md — JOSS front-matter + Summary, Statement of need, Software design, Benchmark examples, AI usage disclosure. State of the field and Research impact statement are left as commented stubs; both require author judgement and neither can be evidenced by the repo today.
• paper/paper.bib — 6 entries, copied verbatim from wiki/literature/bibliography/autolens_literature.bib so the paper and the literature wiki cannot drift apart.
• paper/README.md — drafting checklist + Inara build command.
• paper/.gitignore — excludes the local paper.pdf build output.

Decisions

• Benchmarks framed as "three representative examples." The repo ships four prompts; the fourth (hard_group_multi.md) is intentionally not described. This resolves the drafting note in the original prompt (author chose reframing over adding a fourth paragraph) and is recorded in the README so the two stay consistent.
• Benchmark-results prose is future-tense, because benchmarks/RESULTS.md currently records zero runs for all four benchmarks. The paper does not claim results the repository cannot evidence. Flagged on the README checklist.
• SLACS0946+1006 → SDSSJ0946+1006 to match the cited papers (Vegetti2010, Minor2021) and the literature wiki.
• Author block mirrors the JAX paper (sole corresponding author); "confirm full author list" is on the checklist.

Scripts Changed

None — documentation only. This PR adds four files under paper/ and touches no scripts, notebooks, configs, or library source.

Test Plan

• make validate-literature-citations — passes (Citation metadata is valid.)
• python autoassistant/audit_skill_apis.py — passes (58 files, 120 symbols, 0 missing/broken)
• Every citation key in paper.md resolves against paper.bib (6 cited, 6 defined, 0 missing, 0 unused)
• Body word count 1309 — inside the JOSS 750–1750 target
• YAML front-matter parses; all required JOSS keys present
• Inara PDF build not run — Docker is unavailable in this environment. Build locally before submission (command in paper/README.md).

Notes

No pending-release label: that label does not exist on this repo, is not covered by ensure_workspace_labels.sh, and recent merged PRs (#70, #68, #66) carry no labels. It guards the library-first merge gate, which does not apply to a docs-only change with no upstream library PR.

Heart at ship time: YELLOW (score 55, no RED), acknowledged by the author. Reasons are pre-existing and unrelated to this docs-only change: workspace validation not passing (3 failed, 2026-07-09T09-48-30Z), 58 stale parked script(s).

Closes #69

Generated by the PyAutoLabs agent workflow.