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/annual_plate_addition_estimation.md

@@ -0,0 +1,30 @@
+---
+entity_slug: annual_plate_addition_estimation
+entity_type: Process
+vsm_system: S4
+type_rationale: Annual Plate Addition Estimation is a calculation activity with duration
+  that transforms information about silver usage patterns rather than being a persistent
+  entity that exists independently.
+vsm_rationale: This estimation serves as intelligence gathering that scans the environment
+  to understand true silver demand patterns, enabling Smith to adapt his analysis
+  of trade flows and challenge commonly held beliefs about import purposes.
+classified_at: '2026-02-23T10:43:10.432191'
+---
+
+# Classification: Annual Plate Addition Estimation
+
+## Entity Type
+
+Process
+
+## VSM System
+
+S4
+
+## Type Rationale
+
+Annual Plate Addition Estimation is a calculation activity with duration that transforms information about silver usage patterns rather than being a persistent entity that exists independently.
+
+## VSM Rationale
+
+This estimation serves as intelligence gathering that scans the environment to understand true silver demand patterns, enabling Smith to adapt his analysis of trade flows and challenge commonly held beliefs about import purposes.