Add hub-core package, docs, and State Hub integration scaffold

Extract the first reusable slice (models, schemas, routers, MCP, migrations)
from state-hub with INTENT/SCOPE, agent instructions, workplan, and aligned
inter_hub capability registry index.

hub_core/models/tpsc.py

@@ -0,0 +1,78 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, String, Text, func
+from sqlalchemy.dialects.postgresql import JSON, UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from hub_core.models.base import Base
+
+
+class TPSCCatalog(Base):
+    __tablename__ = "tpsc_catalog"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    slug: Mapped[str] = mapped_column(String(100), nullable=False, unique=True, index=True)
+    name: Mapped[str] = mapped_column(String(200), nullable=False)
+    provider: Mapped[str | None] = mapped_column(String(200), nullable=True)
+    category: Mapped[str | None] = mapped_column(String(100), nullable=True)
+    website_url: Mapped[str | None] = mapped_column(Text, nullable=True)
+    pricing_model: Mapped[str] = mapped_column(String(20), nullable=False, server_default="unknown")
+    gdpr_maturity: Mapped[str] = mapped_column(
+        String(20), nullable=False, server_default="unknown", index=True
+    )
+    gdpr_notes: Mapped[str | None] = mapped_column(Text, nullable=True)
+    dpa_available: Mapped[bool] = mapped_column(Boolean, nullable=False, server_default="false")
+    tos_url: Mapped[str | None] = mapped_column(Text, nullable=True)
+    privacy_policy_url: Mapped[str | None] = mapped_column(Text, nullable=True)
+    data_processing_regions: Mapped[list | None] = mapped_column(JSON, nullable=True)
+    data_retention_notes: Mapped[str | None] = mapped_column(Text, nullable=True)
+    status: Mapped[str] = mapped_column(String(20), nullable=False, server_default="active")
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
+    )
+
+    entries: Mapped[list["TPSCEntry"]] = relationship("TPSCEntry", back_populates="catalog_entry")
+
+
+class TPSCSnapshot(Base):
+    __tablename__ = "tpsc_snapshots"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    repo_id: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True),
+        ForeignKey("managed_repos.id", ondelete="SET NULL"),
+        nullable=True,
+        index=True,
+    )
+    snapshot_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+    source_file: Mapped[str | None] = mapped_column(String(200), nullable=True)
+    entry_count: Mapped[int] = mapped_column(Integer, nullable=False, server_default="0")
+
+    entries: Mapped[list["TPSCEntry"]] = relationship(
+        "TPSCEntry", back_populates="snapshot", cascade="all, delete-orphan"
+    )
+
+
+class TPSCEntry(Base):
+    __tablename__ = "tpsc_entries"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    snapshot_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True),
+        ForeignKey("tpsc_snapshots.id", ondelete="CASCADE"),
+        nullable=False,
+        index=True,
+    )
+    catalog_id: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("tpsc_catalog.id", ondelete="SET NULL"), nullable=True
+    )
+    service_slug: Mapped[str] = mapped_column(String(100), nullable=False, index=True)
+    purpose: Mapped[str | None] = mapped_column(Text, nullable=True)
+    auth_type: Mapped[str | None] = mapped_column(String(50), nullable=True)
+    endpoint_override: Mapped[str | None] = mapped_column(Text, nullable=True)
+    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
+
+    snapshot: Mapped["TPSCSnapshot"] = relationship("TPSCSnapshot", back_populates="entries")
+    catalog_entry: Mapped["TPSCCatalog | None"] = relationship("TPSCCatalog", back_populates="entries")