sciagent code + Gitea Actions CI/CD

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

be0/migrations/004_evidence_artifact_review.sql

@@ -0,0 +1,13 @@
+-- Evidence staff review (approve / reject) on application_artifacts — must match be0/src/initiative_db/models.py ApplicationArtifact
+-- New DBs: loaded by docker-compose postgres init (04_...).
+-- Existing DBs: run once, e.g.
+--   docker exec -i initiative-postgres psql -U initiative -d initiatives < be0/migrations/004_evidence_artifact_review.sql
+--   # or: psql "$INITIATIVE_DATABASE_URL" -f be0/migrations/004_evidence_artifact_review.sql
+
+ALTER TABLE application_artifacts
+  ADD COLUMN IF NOT EXISTS review_status TEXT,
+  ADD COLUMN IF NOT EXISTS reviewed_by UUID REFERENCES users (id) ON DELETE SET NULL,
+  ADD COLUMN IF NOT EXISTS reviewed_at TIMESTAMPTZ;
+
+CREATE INDEX IF NOT EXISTS idx_application_artifacts_review
+  ON application_artifacts (initiative_id, review_status);