extract news-digest into its own repo (vh/nevermore)

The applet outgrew "stack alongside the infra-management workspace" —
it has its own pyproject, multi-tenant deploy story, separate
release cadence, and isn't actually about managing infrastructure.
Lives at https://gitea.phasefinal.com/vh/nevermore now, with
provenance noted in its initial commit.

This commit removes:
  stacks/news-digest/             (full stack tree)
  playbooks/deploy-news-digest.yaml
  scripts/add-digest-user.sh

The existing ana-docker deployment continues running on its baked
local/news-digest:v5 image — nothing changes for the live install
until you choose to redeploy from the new repo. Migration steps
(rename data dir, redeploy, retire old compose dir) are in
nevermore's README.

Updated:
  README.md     — Current stacks listing now points at the new repo
  STATUS.md     — milestones entry for the extraction

README.md

@@ -71,7 +71,7 @@ Per-host snapshots of the running system live under `servers/<host>/system-detai
 **Anaheim non-GPU (ana-docker):**
 - `traefik`, `crowdsec`, `gitea`, `vaultwarden`, `synapse`, `seafile`, `searxng`, `openwebui`, `sillytavern`, `mailrise`, `rustdesk`, `dockge`, `it-tools`
 - (`mattermost` retired 2026-04-21 — compose dir may still linger, containers gone)
-- Notes / feeds: `miniflux` (RSS, 8080), `news-digest` (twice-daily LLM-curated brief, 8181, multi-tenant via `scripts/add-digest-user.sh`), `memos` (note server, 5230)
+- Notes / feeds: `miniflux` (RSS, 8080), `nevermore` (twice-daily LLM-curated brief, 8181, multi-tenant — extracted to its own repo at [`vh/nevermore`](https://gitea.phasefinal.com/vh/nevermore)), `memos` (note server, 5230)
 - Assistant tooling: `task-board` (MCP + dashboard for assistant task state, 7878)
 - Fleet services: `beszel` (metrics hub, port 8090), `dozzle-hub` (log viewer, 8088), `backrest` (restic UI, 9898)
 - Backup target: `rest-server-ana` on port 8000