skills: split f3s into six focused sibling skills (index pattern)

Execute plans/f3s-skill-split-plan.md. Carve the oversized f3s skill into six
f3s-prefixed siblings so each loads on its own triggers, and slim f3s to a hub
(38 reference files -> 10; 119 -> 73 lines):

- f3s-storage       ZFS/zrepl/CARP/NFS-stunnel, nfs-mount-monitor, backups
- f3s-k3s           cluster install, off-LAN access, ingress, etcd, r-node Rex
- f3s-observability Prometheus/Alloy/Loki/Tempo, FreeBSD node_exporter
- f3s-workloads     Immich, Garage, Player, yChat, goprecords/uptimed
- f3s-raspberry-pi  pi0/pi1 NetBSD static site, pi2/pi3 Pi-hole/LAN DNS
- f3s-dtail         dserver deployment/ops (SSH 2222)

f3s hub keeps the master Host-IP table, physical hosts, bhyve, WireGuard mesh,
and off-LAN access as the canonical inward-pointing context, plus a Related
skills block. Applies skill-maintenance best practices: fixes the three inlined
SKILL.md duplications (Pi/webserver, DTail) by moving prose to one canonical home
and keeping each new SKILL.md a slim index that points to its references rather
than re-inlining them. All cross-skill links rewritten to ../../<skill>/references/
form (incl. inbound links from pkgrepo and rocky-vm-setup, and two pre-existing
broken links); verified all 112 relative links resolve.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2 files changed, 2 insertions, 2 deletions

diff --git a/prompts/skills/pkgrepo/SKILL.md b/prompts/skills/pkgrepo/SKILL.md
index 5d3732b..9b0982e 100644
--- a/prompts/skills/pkgrepo/SKILL.md
+++ b/prompts/skills/pkgrepo/SKILL.md
@@ -32,6 +32,6 @@ Use `f3s` alongside this skill when the task depends on broader host-role or clu
 - `fishfinger` and `blowfish` as the OpenBSD frontend hosts
 - `r0-r2` as Rocky Linux x86_64 bhyve VMs
 - `pi2-pi3` as Rocky Linux aarch64 Raspberry Pi nodes
-- `pi0`/`pi1` as NetBSD aarch64 Raspberry Pi nodes (see the `f3s` skill's `bootstrap-netbsd-pi.md`) — NetBSD repo clients and the native NetBSD package build host (`pi0`)
+- `pi0`/`pi1` as NetBSD aarch64 Raspberry Pi nodes (see the `f3s-raspberry-pi` skill's `bootstrap-netbsd-pi.md`) — NetBSD repo clients and the native NetBSD package build host (`pi0`)
 - `earth` as the Fedora laptop used for package publication and verification
 - `f0-f3` as FreeBSD hosts
diff --git a/prompts/skills/pkgrepo/references/client-setup.md b/prompts/skills/pkgrepo/references/client-setup.md
index 2b06e66..1e29c4e 100644
--- a/prompts/skills/pkgrepo/references/client-setup.md
+++ b/prompts/skills/pkgrepo/references/client-setup.md
@@ -101,7 +101,7 @@ Notes:
 
 ## Rocky Linux (r0–r2, pi2–pi3)
 
-`pi0`/`pi1` run NetBSD (see above and the `f3s` skill's `bootstrap-netbsd-pi.md`) and are not Rocky clients of this repo.
+`pi0`/`pi1` run NetBSD (see above and the `f3s-raspberry-pi` skill's `bootstrap-netbsd-pi.md`) and are not Rocky clients of this repo.
 
 Architecture-specific repo URLs:
 - `https://pkgrepo.f3s.buetow.org/rockylinux/9/x86_64/`  (r0–r2)