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_foundation.md

@@ -0,0 +1,32 @@
+---
+entity_slug: agricultural_improvement_foundation
+entity_type: Institution
+vsm_system: S3
+type_rationale: An "Agricultural Improvement Foundation" represents a socially constructed
+  organizational structure designed to govern and systematize efforts toward agricultural
+  enhancement, fitting the definition of an institution as a rule system or governance
+  structure.
+vsm_rationale: As a foundation focused on agricultural improvement, this entity would
+  primarily function in resource allocation and operational control by directing capital
+  and resources toward productive agricultural activities, which aligns with S3 management
+  functions.
+classified_at: '2026-02-23T10:40:40.117120'
+---
+
+# Classification: Agricultural Improvement Foundation
+
+## Entity Type
+
+Institution
+
+## VSM System
+
+S3
+
+## Type Rationale
+
+An "Agricultural Improvement Foundation" represents a socially constructed organizational structure designed to govern and systematize efforts toward agricultural enhancement, fitting the definition of an institution as a rule system or governance structure.
+
+## VSM Rationale
+
+As a foundation focused on agricultural improvement, this entity would primarily function in resource allocation and operational control by directing capital and resources toward productive agricultural activities, which aligns with S3 management functions.