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_improvement_discouragement.md

@@ -0,0 +1,32 @@
+---
+entity_slug: agricultural_improvement_discouragement
+entity_type: Institution
+vsm_system: S5
+type_rationale: Agricultural Improvement Discouragement represents a comprehensive
+  system of feudal rules, laws, and social norms (primogeniture, entails, servile
+  labor) that governed economic behavior rather than being a physical entity, process,
+  or abstract principle.
+vsm_rationale: This institutional framework operates at the S5 level because it defines
+  the fundamental identity and purpose of the feudal economic system, establishing
+  the ultimate authority structures and policy orientations that shaped all lower-level
+  economic activities.
+classified_at: '2026-02-23T10:40:36.572287'
+---
+
+# Classification: Agricultural Improvement Discouragement
+
+## Entity Type
+
+Institution
+
+## VSM System
+
+S5
+
+## Type Rationale
+
+Agricultural Improvement Discouragement represents a comprehensive system of feudal rules, laws, and social norms (primogeniture, entails, servile labor) that governed economic behavior rather than being a physical entity, process, or abstract principle.
+
+## VSM Rationale
+
+This institutional framework operates at the S5 level because it defines the fundamental identity and purpose of the feudal economic system, establishing the ultimate authority structures and policy orientations that shaped all lower-level economic activities.