feat: scrape HN favorites as a Kubernetes CronJob and write to DynamoDB

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

README.md

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+# hackernews-favs-cron
+
+Runs the Hacker News favorites scrape from `nholtware/hackernews-favs` (the AWS
+Lambda version) as a Kubernetes CronJob on the homelab k3s cluster. It still
+writes each batch to the AWS DynamoDB table `hackernews-favs` (same item shape:
+`pk=date#YYYY-MM-DD`, `sk=batch#<uuid>`), so existing readers are unaffected.
+
+- Code: `src/favorites.ts` (fetch + parse), `src/main.ts` (one-shot entrypoint).
+- Deploy: push to `main` -> Forgejo CI builds the image -> `gitops-bump` ->
+  ArgoCD syncs `manifests/hackernews-favs-cron` (CronJob, Sundays 02:00 UTC).
+- Config env: `TABLE_NAME`, `HN_USER` (default `noaoh`), `AWS_REGION`.
+- Credentials: Secret `aws-dynamodb` in namespace `hackernews-favs-cron`, keys
+  `AWS_ACCESS_KEY_ID` / `AWS_SECRET_ACCESS_KEY`. Created by kubectl, never in git.
+  Scope the IAM user to `dynamodb:PutItem` on the table.
+- Run once now: `kubectl create job -n hackernews-favs-cron --from=cronjob/hackernews-favs-cron manual-$(date +%s)`
+- Remove the Lambda schedule once happy: `cdk destroy` in `hackernews-favs`
+  would also delete the table (RemovalPolicy.DESTROY), so disable the EventBridge
+  rule instead.