docs: move f3s/k8s deployment details out to homelab skill

Remove all f3s/k3s/cluster-specific deployment content from README.md,
AGENTS.md, and ychat/DOCKER.md. The DB-backed build's deployment status,
live URL, image tag, PVC, Helm chart, and ArgoCD app details now live in
the private homelab skill's references/ychat.md sub-reference instead of
this public repo.

- README.md: drop the 'Deploying to the f3s k3s cluster' section and the
  'Deployed to f3s' table note; genericize the emptyDir log note.
- AGENTS.md: drop the explicit f3s skill name from the deployment section;
  keep only a generic out-of-scope pointer to the homelab skill.
- ychat/DOCKER.md: remove the 'still running live on the f3s k3s cluster'
  History mention, the 'Not yet deployed to f3s' block, and the entire
  'Deploying to the f3s k3s cluster' section.

1 files changed, 3 insertions, 16 deletions

diff --git a/README.md b/README.md
index 16b949a..a981058 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ are kept here as historical/revival code.
 
 | Subproject | What it is | Status |
 |------------|------------|--------|
-| [`./ychat`](ychat/)   | An HTTP-based web chat server (browsers are the clients; CSS/HTML/JS only). | **Revived, builds in Docker with a mandatory embedded-SQLite backend** (real, persistent registered accounts) — see [`ychat/DOCKER.md`](ychat/DOCKER.md). **Deployed to f3s** (`https://ychat.f3s.lan.buetow.org/`) with a persistent volume backing `/app/data`, image tag `67babb2`. |
+| [`./ychat`](ychat/)   | An HTTP-based web chat server (browsers are the clients; CSS/HTML/JS only). | **Revived, builds in Docker with a mandatory embedded-SQLite backend** (real, persistent registered accounts) — see [`ychat/DOCKER.md`](ychat/DOCKER.md). |
 | [`./yhttpd`](yhttpd/) | A tiny standalone http server derived from ychat's socket/threading engine. | Builds and serves reliably in Docker (verified under concurrent load) — not deployed. See [`./yhttpd/DOCKER.md`](yhttpd/DOCKER.md). |
 | [`./ycurses`](ycurses/) | A curses front-end experiment. | Builds and runs in Docker (a demo, not a service, so nothing to deploy) — see [`./ycurses/BUILD.md`](ycurses/BUILD.md). |
 
@@ -101,8 +101,8 @@ podman rm -f ychat
   in-memory, and unregistered `chat.enableguest=true` guest chatters are
   wiped on restart same as before — only the accounts table persists.
 - **Logs** go to `/app/log/` inside the container (`access_log`, `system_log`,
-  `rooms/<room>`). They're an `emptyDir` in k8s and a container-local dir
-  locally, so they don't persist after `rm`.
+  `rooms/<room>`). They're a container-local dir locally, so they don't
+  persist after `rm`.
 - **Configuration** is `ychat/etc/ychat.conf`, baked into the image at
   `/app/etc/ychat.conf`. You can override any config key at runtime with
   `-o <key> <value>` (the image already does this for
@@ -116,19 +116,6 @@ podman rm -f ychat
 
 ---
 
-## Deploying to the f3s k3s cluster
-
-Deploying ychat to a homelab k3s cluster (image build/push, Helm chart,
-ArgoCD Application, PVC requirements) is homelab-specific and **not**
-documented in this public repo. **The DB-backed build described in this README is now
-deployed** — the live LAN URL (**https://ychat.f3s.lan.buetow.org/**) serves
-image tag `67babb2` with a persistent volume (`ychat-data-pvc`, hostPath-backed
-NFS share) mounted at `/app/data`, so registered accounts survive pod
-restarts. Chart/manifests live in the `conf` repo under
-`f3s/ychat/helm-chart/`.
-
----
-
 ## License
 
 GPL-2.0 (see [`./ychat/COPYING`](ychat/COPYING)). Source: