docs: placeholder bibliography + wiki entry for Vincken 2026

[Jammy2211]

Closes #39

Overview

Vincken 2026 — Euclid Collaboration: Vincken et al., the Euclid DR1 strong lens finding network comparison — is cited in an in-progress Euclid paper but had no entry here. It is not yet on arXiv: DR1 is unreleased and the only available copy is a private Euclid Consortium draft, so there is no authoritative public record to verify against.

This adds a deliberately generic placeholder — enough to make the key citable now and to match-and-replace the moment the paper goes public, and no more.

Scripts Changed

None — this is a knowledge-layer change only (bibliography + wiki). No scripts, notebooks or configs.

Files Changed

File	Change
bibliography/pyautomemory.bib	New @unpublished{Vincken2026} — author/year/topic, with TODOs for arXiv ID, DOI and author list.
wiki/lensing/sources/lens-finding.md	Matching source stub, inserted beside the Q1 Discovery Engine A/B/C entries and before ## See also.
wiki/lensing/log.md	One dated entry recording the placeholder and the refresh it owes, plus a retroactive line for Shajib2025dolphin.

Why the entry is generic

This repo is public and the source is an unpublished EC draft, so the entry records author/year/topic only — no draft-verbatim title, no author list. This follows bibliography/README.md: "If metadata or support is uncertain, add a TODO rather than guessing." The choice was made explicitly by the maintainer at plan approval.

The source stub carries hard guardrails: the single **Supports:** bullet states it is a placeholder with no verified claim, and **Do not use for:** rules out every quantitative or interpretive use.

Follow-up owed

Refresh Vincken2026 once the paper is on arXiv — replace the TODO title/reference with the verified title, arXiv ID, DOI and author list, and replace the placeholder **Supports:** bullet with real claims.

Context corrections

The originating request pointed at arxiv.org/abs/2503.22657 as "Vincken 2026". It is not — that is Shajib et al. 2025, dolphin: A fully automated forward modeling pipeline…, and it is already in this repo (Shajib2025dolphin in the bibliography, full stub in sources/lens-modeling-methods.md), added during the #34/#36 wiki-hygiene pass. Its only gap was a missing log.md line, which this PR closes.

The other half of the original request — citing the paper in the Euclid manuscript — is not in this PR. That .tex lives outside the PyAutoLabs workspace.

Validation

make validate    # validate-literature-citations + validate-structure — both pass
make test        # 17 passed

Vincken2026 is correctly referenced by the new source stub (absent from the validator's unreferenced-keys list).