docs(roadmap): close out infospace tooling S3 and parent roadmap

All three stages of the infospace tooling roadmap are complete. The Wealth
of Nations / VSM example passes 6/6 viability thresholds on 988 entities,
and composition is demonstrated via the supply-chain-vsm example.

- Parent roadmap (roadmap/infospace-tooling/PLAN.md): header now shows the
  closed status with final validation metrics.
- S3 close-out plan (roadmap/infospace-s3-closeout/PLAN.md): records the
  final task dispositions. C.1–C.6 and C.8 done; C.7 (clean per-chapter
  git history) is deferred indefinitely — the task was cosmetic, its
  prerequisite branch no longer exists, and reconstructing 35 archival
  commits would not change any output files. Rationale documented inline.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

roadmap/infospace-tooling/PLAN.md

@@ -1,5 +1,31 @@
 # Viable Infospace Tooling — Roadmap
 
+## Status: CLOSED (2026-04-22)
+
+All three stages complete.
+
+| Stage | Status | Notes |
+|-------|--------|-------|
+| Stage 1 — Platform additions (S1.1–S1.7) | ✅ Done | Entity parser, schema validator, embeddings, graph analysis, eval I/O, batch orchestrator, FCA |
+| Stage 2 — Infospace tooling (S2.1–S2.7)   | ✅ Done | Config model, lifecycle CLI, per-entity eval, collection checks, history, composition, docs |
+| Stage 3 — Example revision (S3.1–S3.5)    | ✅ Done (except cosmetic S3.2) | See `roadmap/infospace-s3-closeout/PLAN.md` |
+
+**Final validation (Wealth of Nations / VSM example, 988 entities):**
+- 988 per-entity evaluations landed
+- Collection checks pass 6/6 viability thresholds (`per_entity_mean = 3.957`
+  against threshold 3.5; `redundancy_ratio = 0.006`; `coverage_ratio = 0.619`;
+  `coherence_components = 0`; `consistency_cycles = 0`;
+  `granularity_entropy = 2.675`)
+- Composition demonstrated via `examples/supply-chain-vsm/`
+- S3.2 (clean per-chapter git history) deferred as cosmetic-only; rationale
+  in the close-out plan
+
+See `roadmap/infospace-s3-closeout/PLAN.md` for the final task-level
+disposition and `examples/infospace-with-history/` for the canonical
+validated example.
+
+---
+
 ## Vision
 
 An **infospace** is a structured, evaluable, composable collection of