docs: rewrite README with structured overview and quick start guide

Replaces the minimal project description with a comprehensive README
including a component overview table, quick start instructions, common
Ansible operations, and links to detailed documentation. Aligns with
Red Panda Approval™ standards.

ansible/inventory/host_vars/caliban.incus.yml

@@ -0,0 +1,23 @@
+---
+# Caliban Configuration - Agent Automation Host
+# Services: caliban (Agent S), alloy, docker, kernos
+
+services:
+  - alloy
+  - caliban
+  - docker
+  - kernos
+
+# Alloy
+alloy_log_level: "warn"
+
+# Kernos MCP Shell Server Configuration
+kernos_user: harper
+kernos_group: harper
+kernos_directory: /srv/kernos
+kernos_port: 22021
+kernos_host: "0.0.0.0"
+kernos_log_level: INFO
+kernos_log_format: json
+kernos_environment: sandbox
+kernos_allow_commands: "apt,awk,base64,bash,cat,chmod,cp,curl,cut,date,dd,df,dig,dmesg,du,echo,env,file,find,free,git,grep,gunzip,gzip,head,host,hostname,id,jq,kill,less,ln,ls,lsblk,lspci,lsusb,make,mkdir,mv,nc,node,nohup,npm,npx,ping,pip,pkill,pnpm,printenv,ps,pwd,python3,rm,rsync,run-captured,scp,sed,sleep,sort,source,ssh,ssh-keygen,ssh-keyscan,stat,sudo,tail,tar,tee,timeout,touch,tr,tree,uname,uniq,unzip,uptime,wc,wget,which,whoami,xargs,xz,zip"