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_innovation_driver.md

@@ -0,0 +1,31 @@
+---
+entity_slug: economic_system_innovation_driver
+entity_type: Element
+vsm_system: S4
+type_rationale: Economic System Innovation Driver represents a collection of factors
+  and forces that exist as persistent motivating and enabling components within economic
+  arrangements, making it a stock-like entity rather than a process or relationship.
+vsm_rationale: As factors that enable adaptation and development of new economic approaches
+  in response to changing circumstances and understanding, this entity primarily functions
+  within the intelligence system that scans the environment and facilitates systemic
+  adaptation.
+classified_at: '2026-02-23T11:02:15.416391'
+---
+
+# Classification: Economic System Innovation Driver
+
+## Entity Type
+
+Element
+
+## VSM System
+
+S4
+
+## Type Rationale
+
+Economic System Innovation Driver represents a collection of factors and forces that exist as persistent motivating and enabling components within economic arrangements, making it a stock-like entity rather than a process or relationship.
+
+## VSM Rationale
+
+As factors that enable adaptation and development of new economic approaches in response to changing circumstances and understanding, this entity primarily functions within the intelligence system that scans the environment and facilitates systemic adaptation.