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_sequence.md

@@ -0,0 +1,31 @@
+---
+entity_slug: agricultural_development_sequence
+entity_type: Process
+vsm_system: S4
+type_rationale: The Agricultural Development Sequence is a historical progression
+  and transformation over time from primitive to advanced farming systems, making
+  it fundamentally a process rather than a static entity.
+vsm_rationale: This sequence represents Smith's analysis of how agricultural systems
+  adapt and evolve in response to changing legal, social, and economic environments,
+  which is the intelligence function of scanning and understanding systemic adaptation
+  patterns.
+classified_at: '2026-02-23T10:40:26.001121'
+---
+
+# Classification: Agricultural Development Sequence
+
+## Entity Type
+
+Process
+
+## VSM System
+
+S4
+
+## Type Rationale
+
+The Agricultural Development Sequence is a historical progression and transformation over time from primitive to advanced farming systems, making it fundamentally a process rather than a static entity.
+
+## VSM Rationale
+
+This sequence represents Smith's analysis of how agricultural systems adapt and evolve in response to changing legal, social, and economic environments, which is the intelligence function of scanning and understanding systemic adaptation patterns.