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/commercial_hospitality_contrast.md

@@ -0,0 +1,32 @@
+---
+entity_slug: commercial_hospitality_contrast
+entity_type: Relation
+vsm_system: S4
+type_rationale: This entity describes a structural dependency between different economic
+  systems and their corresponding patterns of wealth consumption, showing how commerce
+  causally transforms spending habits from maintaining dependents to purchasing manufactured
+  goods.
+vsm_rationale: This contrast represents intelligence about how economic systems adapt
+  to environmental changes, specifically how the introduction of commerce and manufactures
+  fundamentally alters the spending patterns and social structures of traditional
+  societies.
+classified_at: '2026-02-23T10:55:17.347454'
+---
+
+# Classification: Commercial Hospitality Contrast
+
+## Entity Type
+
+Relation
+
+## VSM System
+
+S4
+
+## Type Rationale
+
+This entity describes a structural dependency between different economic systems and their corresponding patterns of wealth consumption, showing how commerce causally transforms spending habits from maintaining dependents to purchasing manufactured goods.
+
+## VSM Rationale
+
+This contrast represents intelligence about how economic systems adapt to environmental changes, specifically how the introduction of commerce and manufactures fundamentally alters the spending patterns and social structures of traditional societies.