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_system_change_agent.md

@@ -0,0 +1,31 @@
+---
+entity_slug: economic_system_change_agent
+entity_type: Element
+vsm_system: S4
+type_rationale: Economic System Change Agent represents individuals, groups, or forces
+  that persist as identifiable actors capable of initiating modifications to economic
+  arrangements, making them stocks or agents that exist independently rather than
+  processes or relations.
+vsm_rationale: These change agents primarily function in the intelligence system by
+  scanning the economic environment, identifying needed adaptations, and driving the
+  evolution of economic systems in response to changing conditions.
+classified_at: '2026-02-23T11:00:50.017054'
+---
+
+# Classification: Economic System Change Agent
+
+## Entity Type
+
+Element
+
+## VSM System
+
+S4
+
+## Type Rationale
+
+Economic System Change Agent represents individuals, groups, or forces that persist as identifiable actors capable of initiating modifications to economic arrangements, making them stocks or agents that exist independently rather than processes or relations.
+
+## VSM Rationale
+
+These change agents primarily function in the intelligence system by scanning the economic environment, identifying needed adaptations, and driving the evolution of economic systems in response to changing conditions.