fix(skiva-1): spara accept, bildref, lokal träningsbank, lärande-loop-dok

- confirm-loop sparar nu även action=accept som positivt exempel i ai_corrections
- imageS3Key sparas vid image_training-samtycke, annars null
- ai_corrections.proposal lagrar det specifika AI-förslaget per item
- BUILD_TRAINING_SAMPLE bankar lokalt till ai_training_bank (ej externt runTask)
- Jobbet kastar aldrig i AAMOS_MODE=gemini
- Migration 0020: ai_corrections.image_s3_key/proposal + ai_training_bank
- docs/28-lärande-loop.md: datakontrakt, samtycke, retention, GDPR-radering
- Tester: accept + bildref (ja/nej) + lokal bank i gemini-läge
- REQUIRE_REAL=1 är AI-fokuserat i gemini-läge; staging mail/S3 får vara mock

apps/worker/test/setup-env.ts

@@ -0,0 +1,12 @@
+/**
+ * Hermetic test environment for worker integration tests.
+ * Must run BEFORE any application module is imported.
+ */
+process.env.NODE_ENV = "test";
+process.env.AAMOS_MODE = "mock";
+process.env.EMAIL_MODE = "log";
+process.env.S3_MODE = "mock";
+process.env.LOG_LEVEL = "error";
+
+process.env.TEST_DATABASE_URL ||= "postgres://app_user:app_dev_password@localhost:5432/cibello_test";
+process.env.DATABASE_URL = process.env.TEST_DATABASE_URL;