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_system_diffusion_mechanism.md

@@ -0,0 +1,30 @@
+---
+entity_slug: economic_system_diffusion_mechanism
+entity_type: Process
+vsm_system: S4
+type_rationale: Economic System Diffusion Mechanism represents an ongoing activity
+  of spreading and adapting economic arrangements across contexts rather than a static
+  entity or rule.
+vsm_rationale: This mechanism operates as an intelligence function that scans different
+  economic environments and facilitates the adaptation of successful systems to new
+  contexts, which aligns with S4's role in environmental scanning and adaptation.
+classified_at: '2026-02-23T11:01:13.129614'
+---
+
+# Classification: Economic System Diffusion Mechanism
+
+## Entity Type
+
+Process
+
+## VSM System
+
+S4
+
+## Type Rationale
+
+Economic System Diffusion Mechanism represents an ongoing activity of spreading and adapting economic arrangements across contexts rather than a static entity or rule.
+
+## VSM Rationale
+
+This mechanism operates as an intelligence function that scans different economic environments and facilitates the adaptation of successful systems to new contexts, which aligns with S4's role in environmental scanning and adaptation.