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/legal_rate_of_interest.md

@@ -0,0 +1,31 @@
+---
+entity_slug: legal_rate_of_interest
+entity_type: Institution
+vsm_system: S3*
+type_rationale: The legal rate of interest is a socially constructed rule system established
+  through statutes to govern lending practices, making it a regulatory institution
+  rather than a natural market mechanism.
+vsm_rationale: As a statutory maximum that ensures compliance with lending regulations
+  and maintains integrity in financial markets, the legal rate of interest functions
+  as an audit mechanism that monitors and controls adherence to established legal
+  standards.
+classified_at: '2026-02-23T11:11:16.285600'
+---
+
+# Classification: Legal Rate Of Interest
+
+## Entity Type
+
+Institution
+
+## VSM System
+
+S3*
+
+## Type Rationale
+
+The legal rate of interest is a socially constructed rule system established through statutes to govern lending practices, making it a regulatory institution rather than a natural market mechanism.
+
+## VSM Rationale
+
+As a statutory maximum that ensures compliance with lending regulations and maintains integrity in financial markets, the legal rate of interest functions as an audit mechanism that monitors and controls adherence to established legal standards.