feat: bootstrap supply intelligence baseline

docs/POLLER_RUNTIME_BOUNDARY.md

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+# Gateway poller runtime boundary
+
+Current repository stage:
+- package publish writes a pending gateway event
+- gateway consumer can poll, apply, and ack that event
+- the repository implementation in this repo is still in-memory only
+
+This means:
+- `published` means the upstream package event was recorded
+- `applied` / `failed` means the in-process consumer flow handled the event during the current process lifetime
+- this repo does not yet claim durable database persistence for gateway event ack state
+
+Runtime shape in the current repo:
+- HTTP debug/manual endpoint: `POST /internal/supply-intelligence/gateway/consume-once`
+- background runtime path: application startup wires a minimal ticker-driven poller loop
+
+Non-goals for the current stage:
+- no MQ / Redis / external scheduler
+- no claim that a full durable publish state machine is complete
+- no claim that in-memory ack state survives restart