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/agricultural_price_ceilings.md

@@ -0,0 +1,31 @@
+---
+entity_slug: agricultural_price_ceilings
+entity_type: Institution
+vsm_system: S5
+type_rationale: Agricultural price ceilings are a socially constructed rule system
+  imposed by government authority to govern market behavior, making them an institutional
+  framework rather than a natural economic element or process.
+vsm_rationale: As government-imposed maximum prices that reflect policy decisions
+  about protecting consumer interests versus market efficiency, agricultural price
+  ceilings operate at the level of ultimate authority and purpose that defines the
+  economic system's identity and values.
+classified_at: '2026-02-23T10:41:24.954626'
+---
+
+# Classification: Agricultural Price Ceilings
+
+## Entity Type
+
+Institution
+
+## VSM System
+
+S5
+
+## Type Rationale
+
+Agricultural price ceilings are a socially constructed rule system imposed by government authority to govern market behavior, making them an institutional framework rather than a natural economic element or process.
+
+## VSM Rationale
+
+As government-imposed maximum prices that reflect policy decisions about protecting consumer interests versus market efficiency, agricultural price ceilings operate at the level of ultimate authority and purpose that defines the economic system's identity and values.