sciagent code + Gitea Actions CI/CD

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

be0/migrations/023_imagehub_dataset_members.sql

@@ -0,0 +1,23 @@
+-- ImageHub: dataset membership — lets users other than the owner work a dataset's tasks
+-- (multi-labeler). MVP treats all members as labelers: they view the dataset and work tasks
+-- assigned to them, while dataset / stage / settings management stays with the owner + platform
+-- admins. The role column is reserved for a future project-admin tier. Idempotent. Apply after 022
+-- (no semicolons inside comments or string literals — the runner splitter is naive):
+--   docker exec -i initiative-postgres psql -U initiative -d initiatives < be0/migrations/023_imagehub_dataset_members.sql
+
+CREATE TABLE IF NOT EXISTS imagehub_dataset_members (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  dataset_id UUID NOT NULL REFERENCES imagehub_datasets(id) ON DELETE CASCADE,
+  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  role TEXT NOT NULL DEFAULT 'member' CHECK (role IN ('project_admin','member')),
+  added_by UUID REFERENCES users(id) ON DELETE SET NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+-- One membership per user per dataset.
+CREATE UNIQUE INDEX IF NOT EXISTS uq_imagehub_dataset_members_user
+  ON imagehub_dataset_members (dataset_id, user_id);
+
+-- "Datasets I am a member of" lookup (the member's dataset list).
+CREATE INDEX IF NOT EXISTS idx_imagehub_dataset_members_user
+  ON imagehub_dataset_members (user_id);