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_learning_process.md

@@ -0,0 +1,31 @@
+---
+entity_slug: economic_system_learning_process
+entity_type: Process
+vsm_system: S4
+type_rationale: The entity describes ongoing activities of acquiring knowledge and
+  understanding about economic arrangements, which represents a flow of learning and
+  development rather than a static element or structural relationship.
+vsm_rationale: This learning process involves scanning the environment, gathering
+  intelligence about different economic systems, and adapting understanding based
+  on experience and observation, which aligns with S4's function of intelligence gathering
+  and environmental adaptation.
+classified_at: '2026-02-23T11:02:37.928017'
+---
+
+# Classification: Economic System Learning Process
+
+## Entity Type
+
+Process
+
+## VSM System
+
+S4
+
+## Type Rationale
+
+The entity describes ongoing activities of acquiring knowledge and understanding about economic arrangements, which represents a flow of learning and development rather than a static element or structural relationship.
+
+## VSM Rationale
+
+This learning process involves scanning the environment, gathering intelligence about different economic systems, and adapting understanding based on experience and observation, which aligns with S4's function of intelligence gathering and environmental adaptation.