sciagent code + Gitea Actions CI/CD

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

be0/migrations/022_imagehub_task_annotations.sql

@@ -0,0 +1,8 @@
+-- ImageHub: a task's labeler annotations (bbox / points / pen / brush / polygon) stored as JSON.
+-- The shared viewer's annotation overlay emits normalized [0..1] vector geometry per slice — small
+-- JSON, persisted on the task so the AnnotationTool can load + save a labeler's work. Idempotent
+-- (ADD COLUMN IF NOT EXISTS) so the startup runner can apply it to volumes that predate it. Apply
+-- after 021 (no semicolons inside comments or string literals — the runner splitter is naive):
+--   docker exec -i initiative-postgres psql -U initiative -d initiatives < be0/migrations/022_imagehub_task_annotations.sql
+
+ALTER TABLE imagehub_tasks ADD COLUMN IF NOT EXISTS annotations JSONB NOT NULL DEFAULT '[]'::jsonb;