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/economic_systems_distinction.md

@@ -0,0 +1,31 @@
+---
+entity_slug: economic_systems_distinction
+entity_type: Principle
+vsm_system: S5
+type_rationale: Economic Systems Distinction represents an abstract theoretical framework
+  that establishes fundamental categories for understanding different approaches to
+  organizing economic activity, functioning as a classificatory rule that holds across
+  different historical contexts.
+vsm_rationale: This distinction operates at the highest level of political economy
+  by establishing the fundamental identity and purpose of different economic arrangements,
+  serving as the foundational framework for policy analysis and system design.
+classified_at: '2026-02-23T11:04:08.490140'
+---
+
+# Classification: Economic Systems Distinction
+
+## Entity Type
+
+Principle
+
+## VSM System
+
+S5
+
+## Type Rationale
+
+Economic Systems Distinction represents an abstract theoretical framework that establishes fundamental categories for understanding different approaches to organizing economic activity, functioning as a classificatory rule that holds across different historical contexts.
+
+## VSM Rationale
+
+This distinction operates at the highest level of political economy by establishing the fundamental identity and purpose of different economic arrangements, serving as the foundational framework for policy analysis and system design.