feat(phase-11): implement Red/Blue business logic services (T-106, T-107, T-108)

T-106: Create test_workflow_service.py with state-machine transitions for the complete test lifecycle (draft -> red_executing -> blue_evaluating -> in_review -> validated/rejected), dual validation by Red/Blue leads, and reopen capability with field cleanup.

T-107: Update status_service.py to use detection_result from Blue Team instead of legacy result field, and differentiate between partial progress (some validated) vs all-in-progress states.

T-108: Create atomic_import_service.py that downloads the Atomic Red Team repo as a ZIP (avoiding API rate limits), parses all atomics YAML files, and creates idempotent TestTemplate records mapped to MITRE techniques.

Includes validation tests for all three tasks (19 checks total).

backend/alembic/versions/b002_add_evidence_team_notes.py

@@ -0,0 +1,46 @@
+"""add_evidence_team_and_notes
+
+Revision ID: b002evidteam
+Revises: b001add0test
+Create Date: 2026-02-09 10:01:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'b002evidteam'
+down_revision: Union[str, Sequence[str], None] = 'b001add0test'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Create teamside enum and add team/notes columns to evidences."""
+    # Create the new enum type
+    teamside_enum = postgresql.ENUM('red', 'blue', name='teamside', create_type=False)
+    op.execute("CREATE TYPE teamside AS ENUM ('red', 'blue')")
+
+    # Add columns
+    op.add_column('evidences', sa.Column(
+        'team',
+        teamside_enum,
+        nullable=False,
+        server_default='red',
+    ))
+    op.add_column('evidences', sa.Column(
+        'notes',
+        sa.Text(),
+        nullable=True,
+    ))
+
+
+def downgrade() -> None:
+    """Remove team/notes columns and drop teamside enum."""
+    op.drop_column('evidences', 'notes')
+    op.drop_column('evidences', 'team')
+    op.execute("DROP TYPE IF EXISTS teamside")