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_security_gradient.md

@@ -0,0 +1,31 @@
+---
+entity_slug: agricultural_security_gradient
+entity_type: Relation
+vsm_system: S5
+type_rationale: The Agricultural Security Gradient represents a structural dependency
+  between legal protection levels and agricultural improvement outcomes, functioning
+  as a causal mechanism that connects different tenure systems to their economic results.
+vsm_rationale: This gradient operates at the policy level by establishing the fundamental
+  relationship between legal frameworks and economic outcomes, representing how different
+  governance structures regarding property rights determine the overall purpose and
+  identity of agricultural systems.
+classified_at: '2026-02-23T10:42:10.707477'
+---
+
+# Classification: Agricultural Security Gradient
+
+## Entity Type
+
+Relation
+
+## VSM System
+
+S5
+
+## Type Rationale
+
+The Agricultural Security Gradient represents a structural dependency between legal protection levels and agricultural improvement outcomes, functioning as a causal mechanism that connects different tenure systems to their economic results.
+
+## VSM Rationale
+
+This gradient operates at the policy level by establishing the fundamental relationship between legal frameworks and economic outcomes, representing how different governance structures regarding property rights determine the overall purpose and identity of agricultural systems.