feat(infospace): add L2 entity classification with type × VSM matrix (S2.9)

Implements the L2 typed-entities layer — each entity is assigned an
Entity Type (Element, Process, Relation, Principle, Institution) and a
VSM System (S1–S5) by an LLM, with one-sentence rationales for each.

New modules:
- markitect/infospace/classification.py — EntityClassification dataclass
  + ENTITY_TYPES / VSM_SYSTEMS controlled vocabularies
- markitect/infospace/classification_io.py — write/read classification
  files (YAML frontmatter + markdown body, mirrors evaluation_io)
- markitect/infospace/classifier.py — build_classification_prompt(),
  parse_classification_response(), run_entity_classification(); batch
  runner writes files incrementally (same resumable pattern as evaluate)

CLI: markitect infospace classify [--entity SLUG] [--provider P] [--model M]
  - Incremental skip: checks output/classifications/ for existing files
  - Defaults to openrouter provider; 2000 max_tokens (Gemini 2.5 Flash
    uses ~787 thinking tokens, so 800 was too low)

CLI: markitect infospace classify-summary [--update-metrics]
  - Entity type counts + VSM system counts with percentages
  - 5 × 6 type × VSM matrix (spots structural blind spots at a glance)
  - --update-metrics writes type_distribution, type_entropy,
    vsm_type_matrix_cells to metrics.yaml

Config: InfospaceConfig gains classifications_dir (default output/classifications)
Schema: schemas/typed-entity-schema-v1.0.md — type/VSM vocabulary tables,
  rationale format rules, validation rules, metrics enabled at L2
infospace.yaml: schemas.typed_entity references typed-entity-schema-v1.0.md

Seed classifications (3): division_of_labour (Process/S1),
  natural_price_as_central_price (Principle/S2),
  invisible_hand_mechanism (Principle/S4)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

markitect/infospace/config.py

@@ -253,6 +253,7 @@ class InfospaceConfig:
     pipeline: Optional[PipelineConfig] = None
     entities_dir: str = "output/entities"
     evaluations_dir: str = "output/evaluations"
+    classifications_dir: str = "output/classifications"
     metrics_dir: str = "output/metrics"
     relations_dir: str = "output/relations"
 
@@ -275,6 +276,8 @@ class InfospaceConfig:
             d["entities_dir"] = self.entities_dir
         if self.evaluations_dir != "output/evaluations":
             d["evaluations_dir"] = self.evaluations_dir
+        if self.classifications_dir != "output/classifications":
+            d["classifications_dir"] = self.classifications_dir
         if self.metrics_dir != "output/metrics":
             d["metrics_dir"] = self.metrics_dir
         if self.relations_dir != "output/relations":
@@ -303,6 +306,7 @@ class InfospaceConfig:
             pipeline=pipeline,
             entities_dir=data.get("entities_dir", "output/entities"),
             evaluations_dir=data.get("evaluations_dir", "output/evaluations"),
+            classifications_dir=data.get("classifications_dir", "output/classifications"),
             metrics_dir=data.get("metrics_dir", "output/metrics"),
             relations_dir=data.get("relations_dir", "output/relations"),
         )