docs: citation audit + correct 8 mis-citations; add Phases 12/13

External reviewer pass over the literature references. Verified entries
against arXiv/DOI/publisher and corrected misattributions that had
propagated across the docs.

Corrected citations (consistent across all docs):
- Bowers-Bowers-Lutz 2026: title was the 2017 paper's
  -> "Rigidity of Koebe Polyhedra and Inversive Distance Circle Packings"
- Liouville theorem: "Springborn 2019" -> Pinkall & Springborn,
  Geom. Dedicata 214 (2021)
- Bobenko-Pinkall-Springborn: "G&T 14 (2010)" -> G&T 19(4) (2015), 2155-2215
- Optimal Cone Singularities: "Crane, Soliman, Ben-Chen, Schroeder"
  -> Soliman, Slepcev, Crane, ACM TOG 37(4)
- Schlaefli formula: "Rivin, Springborn 1999" -> Rivin, Schlenker
- Quasiconformal distortion: "Springborn, Veselov" -> Born, Buecking,
  Springborn (arXiv:1505.01341)
- Period matrices: "Bobenko, Buecking 2009" (was Bobenko-Mercat-Schmies'
  title) -> Bobenko-Mercat-Schmies 2011 + genuine Bobenko-Buecking 2021
- Fabricated entry: "Alexa 2020, DOI 10.1145/3414685.3417840" pointed to
  an unrelated paper (Pixelor) -> Bunge, Herholz, Kazhdan, Botsch 2020
- Stripe Patterns: "Bonneel et al. 2015" -> Knoeppel, Crane, Pinkall,
  Schroeder 2015

Equation-number corrections (verified against the PDFs):
- Glickenstein 2011 "eq. 4.6" -> "§5.2" (no such equation label exists)
- Springborn 2020 "eq. 4.6" -> "§4 variational gradient"
- inversive-distance attribution softened to classical inversive distance

Other:
- DBFEnergy bibliography (separate repo) and convergence half-sentence in
  novelty-statement.md §3.3 (Bobenko-Buecking 2021)
- Status legend (implemented vs planned) at top of references.md
- New Phase 12 (decorated DCE & geometric transition, Chain A, near-term)
  and Phase 13 (canonical tessellations & polyhedral realisation, Chain B
  capstone) in phases.md + research-track.md; 10c scope-boundary note
  clarifying infrastructure vs Lutz-specific algorithms

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

doc/reviewer/briefing.md

@@ -46,12 +46,12 @@ research-only phases the reader can shape at design stage.
 | **Canonical Delaunay tessellations of decorated hyperbolic surfaces** (Lutz 2023, *Geom. Dedicata*; Lutz 2024 PhD thesis) | cut-graph + period matrix + hyperbolic-disk layout as scaffolding; canonical-tessellation algorithm itself outlined | **10c** planned |
 | **Hyperideal polyhedra rigidity** (Bowers–Bowers–Lutz 2026) | HyperIdeal functional + analytic Hessian derivation (805-line LaTeX note) | **9b-analytic** derived; **10c′** KAT planned |
 | **Optimal cone placement / non-Euclidean cone metrics** (Crane et al. 2018) | Cone-singularity port via `ConesUtility` scoped; the *non-Euclidean* extension is the research delta | **9d.1** port + **9d.2** RESEARCH |
-| **Polygon Laplacian on general meshes** (Alexa–Wardetzky 2011; Alexa 2020) | *no Java parent* — first phase a reviewer can shape at design stage | **9f** RESEARCH (planned) |
+| **Polygon Laplacian on general meshes** (Alexa–Wardetzky 2011; Bunge et al. 2020) | *no Java parent* — first phase a reviewer can shape at design stage | **9f** RESEARCH (planned) |
 | **Quasi-isothermic maps** (generalising conformality where exact conformality is impossible — Lawson-correspondence parameterisation) | scoped as a 6-class port (~800 lines) from the Java original: `QuasiisothermicLayout`, `DBFSolution` (discrete Beltrami field), `SinConditionApplication`, `QuasiisothermicDelaunay`, `QuasiisothermicUtility`, `ConformalStructureUtility` | **10e** planned |
-| **Higher-genus + hyperelliptic surfaces** (Bobenko–Bücking 2009 on polyhedral surfaces; period matrices with block-diagonal Z₂ structure) | port of `HyperellipticUtility` + `HyperIdealHyperellipticUtility` scoped; existing period-matrix code as scaffolding | **10b** planned |
+| **Higher-genus + hyperelliptic surfaces** (Bobenko–Mercat–Schmies 2011 / Bobenko–Bücking 2021 on polyhedral period matrices; block-diagonal Z₂ structure) | port of `HyperellipticUtility` + `HyperIdealHyperellipticUtility` scoped; existing period-matrix code as scaffolding | **10b** planned |
 | **Möbius centring for Poincaré-disk layouts** as a variational problem (Lorentz geometry: `E = Σ log(−⟨x,p⟩/√(−⟨x,x⟩))`) | currently we use iterative Fréchet mean in `normalise_hyperbolic()`; the principled variational alternative is scoped via the Java `MobiusCenteringFunctional` port (full gradient + Hessian) | **9d.4** planned |
-| **Boundary-First / interactive flattening** (Crane et al. 2017 BFF; Bonneel et al. 2015 *Stripe Patterns on Surfaces*) | not on the roadmap as ports; documented in [`references.md`](../math/references.md) as comparison points / inspiration for future API design | — |
-| **Schläfli-based variational machinery** (Rivin–Springborn 1999) | derivation done, implementation gated on your view of whether the ~6× speedup over our block-FD path matters at your mesh sizes | **9b-analytic** ready to implement |
+| **Boundary-First / interactive flattening** (Sawhney–Crane 2017 BFF; Knöppel–Crane–Pinkall–Schröder 2015 *Stripe Patterns on Surfaces*) | not on the roadmap as ports; documented in [`references.md`](../math/references.md) as comparison points / inspiration for future API design | — |
+| **Schläfli-based variational machinery** (Rivin–Schlenker 1999) | derivation done, implementation gated on your view of whether the ~6× speedup over our block-FD path matters at your mesh sizes | **9b-analytic** ready to implement |
 
 See [`doc/roadmap/phases.md`](../roadmap/phases.md) for the per-phase
 porting plan, [`doc/roadmap/research-track.md`](../roadmap/research-track.md)
@@ -71,11 +71,12 @@ rationale).
   Tier-1/2.  Decorated-DCE / canonical-tessellation / hyperideal line:
   Bobenko–Lutz 2024 IMRN; Bobenko–Lutz 2025 *DCG*; Lutz 2023
   *Geom. Dedicata*; Lutz 2024 PhD; Bowers–Bowers–Lutz 2026.  Cones,
-  polyhedra, period matrices: Crane et al. 2018; Springborn 2019
-  (hyperbolic polyhedra); Bobenko–Bücking 2009; Rivin–Springborn 1999.
-  Polygon Laplacians: Alexa–Wardetzky 2011; Alexa 2020.  Integrable +
-  practical-flattening context: Springborn–Veselov 2015 (cluster
-  dynamics); Crane et al. 2017 (BFF); Bonneel et al. 2015 (Stripe
+  polyhedra, period matrices: Soliman–Slepčev–Crane 2018; Pinkall–Springborn
+  2021 (discrete Liouville); Bobenko–Mercat–Schmies 2011 / Bobenko–Bücking
+  2021; Rivin–Schlenker 1999.
+  Polygon Laplacians: Alexa–Wardetzky 2011; Bunge et al. 2020.  Integrable +
+  practical-flattening context: Born–Bücking–Springborn 2015 (quasiconformal
+  distortion); Sawhney–Crane 2017 (BFF); Knöppel et al. 2015 (Stripe
   Patterns).
 - **Phase 9f** (polygon Laplacian on non-triangular meshes) added as
   RESEARCH-only — no Java parent — so you can influence its design