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/inland_duty_drawback.md

@@ -0,0 +1,30 @@
+---
+entity_slug: inland_duty_drawback
+entity_type: Institution
+vsm_system: S3*
+type_rationale: Inland Duty Drawback is a socially constructed rule system that governs
+  the recovery of domestic duties on exported goods, establishing formal procedures
+  and norms for preventing internal taxation from creating trade barriers.
+vsm_rationale: This mechanism functions as an audit and compliance system that ensures
+  the integrity of trade policy by inspecting and verifying that domestic duties are
+  properly recovered to maintain fair competition in international markets.
+classified_at: '2026-02-23T11:09:51.228880'
+---
+
+# Classification: Inland Duty Drawback
+
+## Entity Type
+
+Institution
+
+## VSM System
+
+S3*
+
+## Type Rationale
+
+Inland Duty Drawback is a socially constructed rule system that governs the recovery of domestic duties on exported goods, establishing formal procedures and norms for preventing internal taxation from creating trade barriers.
+
+## VSM Rationale
+
+This mechanism functions as an audit and compliance system that ensures the integrity of trade policy by inspecting and verifying that domestic duties are properly recovered to maintain fair competition in international markets.