Add comprehensive documentation for employee learning platform

- Created handover document outlining design decisions and application functionality.
- Developed implementation plan detailing phased approach for service development.
- Specified ingestion service responsibilities, API surface, and processing pipeline.

app/services/ingestion/src/routes/documents.ts

@@ -0,0 +1,29 @@
+import type { FastifyPluginAsync } from 'fastify';
+import { IngestBodySchema } from '../types.js';
+import { createJob, getJob } from '../jobs/queue.js';
+
+const documentRoutes: FastifyPluginAsync = async (app) => {
+  app.post('/ingest', async (request, reply) => {
+    const parsed = IngestBodySchema.safeParse(request.body);
+    if (!parsed.success) {
+      return reply.status(400).send({ error: 'Invalid request body', details: parsed.error.format() });
+    }
+    const job = createJob(parsed.data);
+    return reply.status(202).send({ jobId: job.id, status: job.status });
+  });
+
+  app.get<{ Params: { jobId: string } }>('/status/:jobId', async (request, reply) => {
+    const job = getJob(request.params.jobId);
+    if (!job) {
+      return reply.status(404).send({ error: 'Job not found' });
+    }
+    return reply.send({
+      jobId: job.id,
+      status: job.status,
+      progress: job.progress,
+      error: job.error,
+    });
+  });
+};
+
+export default documentRoutes;