chore: feature branch setup with .env secrets and .env.example

.env.example

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+# Copy to `.env` and fill in values. `.env` is gitignored.
+FORGEJO_TOKEN=
+
+# --- databases (compose service `db`) ---
+POSTGRES_USER=kirche
+POSTGRES_PASSWORD=
+POSTGRES_DB=kirche_einfach
+DATABASE_URL=postgresql+psycopg://kirche:<password>@db:5432/kirche_einfach
+TEST_DATABASE_URL=postgresql+psycopg://kirche:<password>@db:5432/kirche_einfach_test
+
+# --- langflow (authoring, dev only) ---
+LANGFLOW_URL=http://langflow:7860
+LANGFLOW_SUPERUSER=langflow
+LANGFLOW_SUPERUSER_PASSWORD=
+LANGFLOW_SECRET_KEY=
+# Single static key; validated against env (LANGFLOW_API_KEY_SOURCE=env), superuser scope.
+LANGFLOW_API_KEY=sk-
+
+# --- lfx (flow runtime) ---
+LFX_URL=http://lfx:6004
+
+# --- LLM (optional; tests mock the provider without it) ---
+# LLM_API_KEY=

AGENTS.md

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+# Agents
+
+## Git
+
+When committing: `git add -A && git commit -m "<message>"`. When pushing: `git push` (branch is tracking `origin/main`).