o: add generate command for one-shot prompts

Uses /generate 9P file - no session/agent context needed.
Example: o generate 'explain monads'

data/scripts/o

@@ -200,6 +200,27 @@ cmd_ls() {
     fi
 }
 
+cmd_generate() {
+    # One-shot generation via /generate (no session/agent needed)
+    # Usage: o generate "prompt"
+    #        echo "prompt" | o generate
+    #        o generate -1 "prompt"  (same as above)
+    local prompt=""
+    
+    # Handle -1 flag (ignored, for compatibility)
+    [[ "${1:-}" == "-1" ]] && shift
+    
+    if [[ $# -gt 0 ]]; then
+        prompt="$*"
+    else
+        prompt=$(cat)
+    fi
+    
+    [[ -z "$prompt" ]] && { echo "usage: o generate <prompt>" >&2; exit 1; }
+    
+    printf '%s' "$prompt" | ollie-9p rdwr generate
+}
+
 cmd_readloop() {
     if [[ $# -lt 1 ]]; then
         echo "usage: o readloop <path>" >&2
@@ -388,6 +409,8 @@ Commands:
   readloop <path>      Read in a loop (re-reads after return)
   ls [path]            List namespace entries
 
+  generate <prompt>    One-shot generation (no session needed)
+
   ctl <cmd>            Send control command to agent
   stop                 Interrupt running agent
   kill                 Kill active session
@@ -408,6 +431,7 @@ Examples:
   o ls                           # list at current context level
   o ls session                   # list all sessions
   o read models                  # read root-level file
+  o generate "explain monads"    # one-shot, no session
   export session=foo agent=bar   # set context
   o read chat                    # read agent's chat
   o readloop statewait           # blocks until agent state changes
@@ -427,6 +451,7 @@ case "$subcmd" in
     write)    cmd_write "$@" ;;
     readloop) cmd_readloop "$@" ;;
     ls)       cmd_ls "$@" ;;
+    generate) cmd_generate "$@" ;;
     ctl)      cmd_ctl "$@" ;;
     stop)     cmd_stop "$@" ;;
     kill)     cmd_kill "$@" ;;