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/economic_development_sequence.md

@@ -0,0 +1,31 @@
+---
+entity_slug: economic_development_sequence
+entity_type: Principle
+vsm_system: S4
+type_rationale: The Economic Development Sequence represents an abstract law about
+  how economic development invariably follows a predictable pattern based on transportation
+  access, making it a theoretical claim that holds across different contexts and regions.
+vsm_rationale: This principle functions as intelligence about how economies adapt
+  to their environment by developing first where market access is optimal, representing
+  the system's capacity to scan and respond to environmental constraints like transportation
+  costs.
+classified_at: '2026-02-23T10:59:29.715674'
+---
+
+# Classification: Economic Development Sequence
+
+## Entity Type
+
+Principle
+
+## VSM System
+
+S4
+
+## Type Rationale
+
+The Economic Development Sequence represents an abstract law about how economic development invariably follows a predictable pattern based on transportation access, making it a theoretical claim that holds across different contexts and regions.
+
+## VSM Rationale
+
+This principle functions as intelligence about how economies adapt to their environment by developing first where market access is optimal, representing the system's capacity to scan and respond to environmental constraints like transportation costs.