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/law_of_primogeniture.md

@@ -0,0 +1,31 @@
+---
+entity_slug: law_of_primogeniture
+entity_type: Institution
+vsm_system: S5
+type_rationale: The Law of Primogeniture is a socially constructed legal rule system
+  that governs inheritance practices and shapes the structure of landed property ownership
+  across society.
+vsm_rationale: This inheritance law operates at the policy level by defining the fundamental
+  identity and purpose of how landed estates should be transmitted across generations,
+  representing ultimate authority over property succession that shapes the entire
+  economic system's character.
+classified_at: '2026-02-23T11:11:12.779473'
+---
+
+# Classification: Law Of Primogeniture
+
+## Entity Type
+
+Institution
+
+## VSM System
+
+S5
+
+## Type Rationale
+
+The Law of Primogeniture is a socially constructed legal rule system that governs inheritance practices and shapes the structure of landed property ownership across society.
+
+## VSM Rationale
+
+This inheritance law operates at the policy level by defining the fundamental identity and purpose of how landed estates should be transmitted across generations, representing ultimate authority over property succession that shapes the entire economic system's character.