feat(infospace): add infospace configuration model and state (S2.1)

InfospaceConfig (topic, disciplines, schemas, competency questions,
viability thresholds, pipeline) with YAML load/save and directory
discovery. InfospaceState aggregates entities, evaluations, and
viability checks for status reporting.

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

markitect/infospace/__init__.py

@@ -39,6 +39,23 @@ from .evaluation_io import (
     write_entity_evaluation,
     write_snapshot,
 )
+from .config import (
+    DisciplineBinding,
+    InfospaceConfig,
+    PipelineConfig,
+    PipelineStage,
+    SchemaRegistry,
+    TopicConfig,
+    ViabilityThreshold,
+    find_infospace_config,
+    load_infospace_config,
+    save_infospace_config,
+)
+from .state import (
+    InfospaceState,
+    ViabilityResult,
+    build_state,
+)
 
 __all__ = [
     "EntityMeta",
@@ -72,4 +89,19 @@ __all__ = [
     "read_snapshot",
     "write_entity_evaluation",
     "write_snapshot",
+    # Config
+    "DisciplineBinding",
+    "InfospaceConfig",
+    "PipelineConfig",
+    "PipelineStage",
+    "SchemaRegistry",
+    "TopicConfig",
+    "ViabilityThreshold",
+    "find_infospace_config",
+    "load_infospace_config",
+    "save_infospace_config",
+    # State
+    "InfospaceState",
+    "ViabilityResult",
+    "build_state",
 ]