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>

markitect/infospace/classification_io.py

@@ -55,6 +55,17 @@ def write_entity_classification(c: EntityClassification, path: Path) -> None:
         lines.append(c.vsm_rationale)
         lines.append("")
 
+    if c.links_mechanism:
+        lines.append("## Links")
+        lines.append("")
+        if c.links_subject:
+            lines.append(f"**Subject:** {c.links_subject}")
+        if c.links_object:
+            lines.append(f"**Object:** {c.links_object}")
+        lines.append("")
+        lines.append(c.links_mechanism)
+        lines.append("")
+
     path.parent.mkdir(parents=True, exist_ok=True)
     path.write_text("\n".join(lines), encoding="utf-8")