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/natural_preference_cultivation.md

@@ -0,0 +1,31 @@
+---
+entity_slug: natural_preference_cultivation
+entity_type: Principle
+vsm_system: S4
+type_rationale: Natural Preference Cultivation represents an abstract law about human
+  nature that Smith claims holds universally across economic development stages, making
+  it a theoretical principle rather than a concrete entity or process.
+vsm_rationale: This principle functions as intelligence about human behavioral patterns
+  that helps explain and predict capital allocation decisions and economic development
+  trajectories, serving the system's need to understand environmental and behavioral
+  constraints.
+classified_at: '2026-02-23T11:18:45.637712'
+---
+
+# Classification: Natural Preference Cultivation
+
+## Entity Type
+
+Principle
+
+## VSM System
+
+S4
+
+## Type Rationale
+
+Natural Preference Cultivation represents an abstract law about human nature that Smith claims holds universally across economic development stages, making it a theoretical principle rather than a concrete entity or process.
+
+## VSM Rationale
+
+This principle functions as intelligence about human behavioral patterns that helps explain and predict capital allocation decisions and economic development trajectories, serving the system's need to understand environmental and behavioral constraints.