Merge fix/docker-prompts-packaging into dev

Package api/prompts into the Docker image and give the Dockerized proxy a
route to a host-run Ollama. M1's narrator pipeline was proven via venv-on-
host; these were the two Docker-path gaps the client HTTP loop surfaced.

api/.env.example

@@ -2,6 +2,10 @@
 # any of these — keys live only in the proxy (charter §4).
 
 # Where the proxy sends model calls in dev (Ollama on the homelab).
+# Running the proxy IN DOCKER with Ollama on THIS host? localhost points at the
+# container, not the host — use http://host.docker.internal:11434 instead
+# (docker-compose.yml maps that name via host-gateway). Bare-metal/venv: keep
+# localhost. Homelab Ollama: use its address.
 OLLAMA_BASE_URL=http://localhost:11434
 
 # Prod model provider (charter §4). Leave blank in dev.

api/Dockerfile

@@ -12,8 +12,10 @@ WORKDIR /app
 COPY api/requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
-# App code + the schema contract (single source of truth in docs/schemas).
+# App code, the role prompts (§16 — prompts are source code), and the schema
+# contract (single source of truth in docs/schemas).
 COPY api/app ./app
+COPY api/prompts ./prompts
 COPY docs/schemas ./schemas
 
 # Run as non-root.

docker-compose.yml

@@ -14,9 +14,17 @@ services:
         required: false
     environment:
       PORT: 8000
-    # Mount source + schemas so edits are live without a rebuild.
+    # Reach a host-run Ollama from inside the container. On Linux, localhost in
+    # the container is the container itself, so OLLAMA_BASE_URL must be
+    # http://host.docker.internal:11434 (set in api/.env); this maps that name
+    # to the Docker host. Harmless when Ollama is on the homelab instead.
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
+    # Mount source + prompts + schemas so edits are live without a rebuild.
+    # Prompts are source code (§16) — editing a prompt should reload like code.
     volumes:
       - ./api/app:/app/app:ro
+      - ./api/prompts:/app/prompts:ro
       - ./docs/schemas:/app/schemas:ro
     command: >
       uvicorn app.main:app --host 0.0.0.0 --port 8000 --reload