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_development_constraints.md

@@ -0,0 +1,32 @@
+---
+entity_slug: agricultural_development_constraints
+entity_type: Institution
+vsm_system: S1
+type_rationale: Agricultural Development Constraints represents a comprehensive system
+  of socially constructed rules, laws, and governance structures (primogeniture, entails,
+  servile labor systems) that collectively formed the institutional framework governing
+  agricultural production.
+vsm_rationale: These constraints operated at the level of primary agricultural operations
+  by directly limiting the productive activities, investment incentives, and improvement
+  possibilities within the fundamental agricultural sector that formed the base of
+  the economic system.
+classified_at: '2026-02-23T10:40:22.983960'
+---
+
+# Classification: Agricultural Development Constraints
+
+## Entity Type
+
+Institution
+
+## VSM System
+
+S1
+
+## Type Rationale
+
+Agricultural Development Constraints represents a comprehensive system of socially constructed rules, laws, and governance structures (primogeniture, entails, servile labor systems) that collectively formed the institutional framework governing agricultural production.
+
+## VSM Rationale
+
+These constraints operated at the level of primary agricultural operations by directly limiting the productive activities, investment incentives, and improvement possibilities within the fundamental agricultural sector that formed the base of the economic system.