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/free_ports.md

@@ -0,0 +1,31 @@
+---
+entity_slug: free_ports
+entity_type: Institution
+vsm_system: S3*
+type_rationale: Free ports are socially constructed governance structures that establish
+  specific rule systems for trade within designated locations, creating institutional
+  frameworks that differ from the broader national trade regulations.
+vsm_rationale: Free ports function as audit and compliance mechanisms that inspect
+  and regulate the flow of goods across borders, representing specialized customs
+  enforcement systems that maintain integrity between restricted and unrestricted
+  trade zones.
+classified_at: '2026-02-23T11:07:37.930718'
+---
+
+# Classification: Free Ports
+
+## Entity Type
+
+Institution
+
+## VSM System
+
+S3*
+
+## Type Rationale
+
+Free ports are socially constructed governance structures that establish specific rule systems for trade within designated locations, creating institutional frameworks that differ from the broader national trade regulations.
+
+## VSM Rationale
+
+Free ports function as audit and compliance mechanisms that inspect and regulate the flow of goods across borders, representing specialized customs enforcement systems that maintain integrity between restricted and unrestricted trade zones.