sciagent code + Gitea Actions CI/CD

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

be0/migrations/024_imagehub_dataset_project_link.sql

@@ -0,0 +1,13 @@
+-- ImageHub: link a dataset to a research project (the "workspace" superstructure). Nullable,
+-- so existing datasets stay unlinked and a dataset can still exist standalone. A dataset created
+-- from a project cockpit attaches to that project. ON DELETE SET NULL so deleting a project
+-- orphans its datasets rather than dropping the imaging data. Idempotent. Apply after 023
+-- (no semicolons inside comments or string literals — the runner splitter is naive):
+--   docker exec -i initiative-postgres psql -U initiative -d initiatives < be0/migrations/024_imagehub_dataset_project_link.sql
+
+ALTER TABLE imagehub_datasets
+  ADD COLUMN IF NOT EXISTS research_project_id UUID REFERENCES research_projects(id) ON DELETE SET NULL;
+
+-- "Datasets in this project" lookup (the project-scoped dataset list).
+CREATE INDEX IF NOT EXISTS idx_imagehub_datasets_research_project
+  ON imagehub_datasets (research_project_id);