docs(roadmap): add phase orchestration system mirroring the reviewer audit workflow

Brings doc/roadmap/ to the same operational level as doc/reviewer/ by adding
the two missing structural files and updating existing docs to close the gap
identified in the system review.

New files:
- doc/roadmap/phase-orchestration.md  — master phase table (model assignments,
  session IDs, status, review-gate checklist); mirrors finding-orchestration.md
- doc/roadmap/session-prompts.md      — copy-paste-ready prompts for P1–P4
  (Haiku/Sonnet/Opus) + universal Opus review gate; mirrors reviewer/session-prompts.md

Updated files:
- CLAUDE.md: roadmap section now lists porting-status.md, phase-orchestration.md,
  session-prompts.md; reviewer section adds finding-orchestration.md and
  session-prompts.md; agentic-workflow section has direct "S3 is next / P1 is next"
  entry points so agents don't need to derive the next action from scratch
- doc/roadmap/phases.md: Current-focus table at the top (7 tracks, next session
  per track, gating); cross-links to geometry-central-comparison.md,
  software-landscape.md, complexity.md added in GC and 9b-analytic sections
- doc/roadmap/porting-status.md: snapshot date updated to 2026-05-31 (post S1+S2);
  test count replaced by reference to doc/api/tests.md; §4 gains four new solver
  rows (newton_core refactor, NewtonStatus enum, diagnostics, selectable clamp mode);
  §7 gains four new research-extension rows from S1/S2
- doc/roadmap/research-track.md: header companion-docs section links to
  novelty-statement.md, software-landscape.md, and phase-orchestration.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

doc/roadmap/phase-orchestration.md

@@ -55,10 +55,10 @@ Status: ✅ done · 🔲 ready/planned · ⏸ planned-blocked-by-prereq · ⛔ b
 | 9a.1 CP-Euclidean | 🔌 | ✅ | — | — | — | done |
 | 9a.2 inversive-distance | 🔬 | ✅ | — | — | — | done |
 | 9b block-FD HyperIdeal Hessian | 🔬 | ✅ | — | — | — | done |
-| **9g.1 conformal-quality measures** | 🔌 | 🔲 **ready** | none | Porter · Sonnet | quick | ~3 d |
-| **9h.1 CLI --tol/--max-iter** | 🧱 | 🔲 **ready** | none | Haiku/Sonnet | quick | ~30 m |
-| **9h.2 CLI cp/inv-dist models** | 🧱 | 🔲 **ready** | 9a ✅ | Sonnet | quick | 2–4 h |
-| **9d.3 stereographic layout (S²→ℂ)** | 🔌 | 🔲 **ready** | none | Porter · Sonnet | sphere | ~3 d |
+| **9g.1 conformal-quality measures** | 🔌 | ✅ 1375878 | none | Porter · Sonnet | quick | ~3 d |
+| **9h.1 CLI --tol/--max-iter** | 🧱 | ✅ 1375878 | none | Haiku/Sonnet | quick | ~30 m |
+| **9h.2 CLI cp/inv-dist models** | 🧱 | ✅ 1375878 | 9a ✅ | Sonnet | quick | 2–4 h |
+| **9d.3 stereographic layout (S²→ℂ)** | 🔌 | ✅ 1375878 | none | Porter · Sonnet | sphere | ~3 d |
 | **9d.4 Möbius-centering functional** | 🔌 | 🔲 **ready** | Phase 7 ✅ | Porter · Sonnet | sphere | ~3 d |
 | **9e circle-pattern layout** | 🔌 | 🔲 **ready** | 9a.1 ✅ | Porter · Sonnet | — | ~1 wk |
 | **9d.1 ConesUtility (Euclidean)** | 🔌 | 🔲 **ready** | none | Porter · Sonnet | cones | ~1 wk |