feat(example): add L2 classifications for 823/988 WoN entities (S3.4)

Batch classification via OpenRouter (claude-sonnet-4). 165 entities
remain unclassified due to credit exhaustion; incremental skip means
a follow-up run will complete them automatically.

Type × VSM matrix (823 entities):
                  S1   S2   S3  S3*   S4   S5
  Element         86   75   58   21   43   32  (315 total, 38%)
  Process         39   42   37   17   67   24  (226 total, 28%)
  Institution      4   12   30   24    .   52  (122 total, 15%)
  Principle        3    7   15    2   43   32  (102 total, 12%)
  Relation         2   14    5    5   22   10   (58 total,  7%)
  Matrix fill: 29/30 cells (Institution/S4 empty — expected)

Metrics updated: type_entropy=2.0936, vsm_type_matrix_cells=29

Also:
- BatchEvaluator gains delay_seconds param for rate-limited providers
- classify CLI gains --rpm option (--rpm 10 for Gemini free tier)
- history.write_metrics_file now handles non-float metric values
  (type_distribution is a dict, was crashing round())
- run_entity_classification forwards delay_seconds to BatchEvaluator
- classify-links and graph commands added by user (entities --by-type,
  graph --format mermaid/dot, classify-links for Relation enrichment)

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

examples/infospace-with-history/output/classifications/natural_liberty_in_trade.md

@@ -0,0 +1,30 @@
+---
+entity_slug: natural_liberty_in_trade
+entity_type: Principle
+vsm_system: S5
+type_rationale: Natural Liberty in Trade represents an abstract theoretical law that
+  Smith posits will hold across economic contexts - that freedom from artificial restrictions
+  will naturally lead to efficient resource allocation and national prosperity.
+vsm_rationale: This principle operates at the policy level by defining the fundamental
+  purpose and identity of economic systems, establishing the ultimate authority of
+  individual freedom over government direction in trade and investment decisions.
+classified_at: '2026-02-23T11:18:28.269289'
+---
+
+# Classification: Natural Liberty In Trade
+
+## Entity Type
+
+Principle
+
+## VSM System
+
+S5
+
+## Type Rationale
+
+Natural Liberty in Trade represents an abstract theoretical law that Smith posits will hold across economic contexts - that freedom from artificial restrictions will naturally lead to efficient resource allocation and national prosperity.
+
+## VSM Rationale
+
+This principle operates at the policy level by defining the fundamental purpose and identity of economic systems, establishing the ultimate authority of individual freedom over government direction in trade and investment decisions.