Implement Phase 1 task 1.8 (Redis Streams publisher + main wiring)

- Bounded in-memory queue (default 10000); overflow throws PublishOverflowError
  so the framing layer skips ACK and the device retransmits.
- Background worker drains via XADD with MAXLEN ~ approximate trimming.
- JSON serialization with sentinel encoding for bigint/Buffer/Date; correctly
  handles Buffer.prototype.toJSON firing before the replacer.
- AdapterContext.publish(position, codec) with codec-label closure at dispatch
  in adapters/teltonika/index.ts; zero changes to the three codec parsers.
- connectRedis with retry-on-startup; main.ts wires the full pipeline.
- installGracefulShutdown stubbed (full hardening in task 1.12).
- 19 new tests (17 unit + 2 Docker-conditional integration). Total 81 passing.

test/core/server.test.ts

@@ -19,7 +19,7 @@ function makeMockContext(): AdapterContext {
   };
 
   return {
-    publish: vi.fn(async (_p: Position) => {}),
+    publish: vi.fn(async (_p: Position, _codec) => {}),
     logger,
     metrics,
   };