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_spatial_inequality.md

@@ -0,0 +1,30 @@
+---
+entity_slug: economic_spatial_inequality
+entity_type: Principle
+vsm_system: S4
+type_rationale: Economic spatial inequality represents an abstract law about how geographical
+  location systematically determines economic outcomes across different regions, making
+  it a theoretical principle rather than a concrete entity or process.
+vsm_rationale: This principle emerges from the economic system's intelligence function
+  as it describes how the system adapts to and organizes around environmental constraints
+  like geography and market access to create persistent spatial patterns.
+classified_at: '2026-02-23T11:00:03.420704'
+---
+
+# Classification: Economic Spatial Inequality
+
+## Entity Type
+
+Principle
+
+## VSM System
+
+S4
+
+## Type Rationale
+
+Economic spatial inequality represents an abstract law about how geographical location systematically determines economic outcomes across different regions, making it a theoretical principle rather than a concrete entity or process.
+
+## VSM Rationale
+
+This principle emerges from the economic system's intelligence function as it describes how the system adapts to and organizes around environmental constraints like geography and market access to create persistent spatial patterns.