feat(example): add supply-chain-vsm composition demo (S3.5)

Demonstrates infospace composition: the Wealth of Nations infospace is
used as a discipline, applying Smith's economic framework as a lens to
analyse modern supply chain management concepts.

New example: examples/supply-chain-vsm/
- infospace.yaml binding WoN as discipline (../infospace-with-history)
- 3 source documents: coordination mechanisms, capital & inventory,
  market structure (~400 words each, original content)
- supply-chain-entity-schema-v1.0.md with WoN Concept required section
- won-mapping-schema-v1.0.md with Conceptual Continuity rating
- artifacts/won-reference/core-entities.md — 12 curated WoN entities
  for injection as discipline context
- 8 hand-crafted entity files demonstrating LLM output format
- 3 mapping files with full rationale and VSM inheritance chains
- Viable: YES (5/5 thresholds)

Key mappings demonstrated:
  Demand Signal          → Effectual Demand        (Strong, S2)
  Vendor-Managed Inventory → Division of Labour    (Strong, S1/S2)
  Just-in-Time Inventory → Circulating Capital     (Strong, S1/S3)
  Bullwhip Effect        → Natural Price           (Moderate, S2)
  Platform Intermediary  → Merchant Capital        (Strong, S2/S4)
  Monopsony Power        → Combination of Masters  (Strong, S3*)

Platform fix: entity_parser.py now recognises ## Supply Chain Domain
as a domain alias for ## Economic Domain, enabling composed infospaces
to use their own domain section name.

Tutorial §13 rewritten with real commands, real output, and the full
mapping table from the demo.

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

examples/supply-chain-vsm/schemas/supply-chain-entity-schema-v1.0.md

@@ -0,0 +1,59 @@
+# Supply Chain Entity Schema v1.0
+
+Every extracted entity must contain the following sections in this order.
+
+## Required Sections
+
+### H1 Heading
+
+The entity name in title case. Should be a noun phrase identifying a
+distinct concept, mechanism, or structure in supply chain management.
+
+Example: `# Bullwhip Effect`
+
+### Definition
+
+20–150 words. Precise, non-circular definition of the concept. Must
+identify what it is, not just what it does. Avoid defining a term
+using the term itself.
+
+### Source
+
+The source document this entity was extracted from, citing section
+if available. Format: `[Source Name], [Section]`
+
+### Supply Chain Domain
+
+One of: **Coordination**, **Capital Management**, **Market Structure**,
+**Risk**, **Logistics**
+
+### VSM Assignment
+
+One of: S1, S2, S3, S3*, S4, S5 — which layer of the Viable System Model
+this entity primarily inhabits. Brief rationale (one sentence).
+
+### WoN Concept
+
+The Wealth of Nations concept this entity most directly corresponds to.
+State the WoN entity name and a one-sentence explanation of the connection.
+If no direct correspondence exists, state "No direct WoN analogue" and
+explain why.
+
+## Optional Sections
+
+### Modern Context
+
+Additional notes on how the concept has evolved since Smith's time, or
+how it differs from its classical form.
+
+## Quality Metrics
+
+Evaluation rubric for per-entity LLM assessment:
+
+- **Definition Precision** (1–5): Is the definition specific, non-circular,
+  and distinguishable from adjacent concepts?
+- **Source Grounding** (1–5): Is the entity grounded in the source material?
+- **Domain Placement** (1–5): Is the supply chain domain assignment correct?
+- **WoN Relevance** (1–5): Is the WoN mapping substantive and well-reasoned?
+- **Explanatory Value** (1–5): Does this entity contribute to understanding
+  modern supply chains through the WoN lens?