o: support root-relative paths with leading /

Paths starting with / are treated as root-relative, ignoring
the current context prefix. This allows accessing root-level
files/directories even when in a session or agent context.

Example: o myproj/coding ls /bypass  # list root bypass/ dir

data/scripts/o

@@ -45,6 +45,20 @@ is_command() {
     return 1
 }
 
+# ── Path resolution helper ──────────────────────────────────────
+# Resolves a path: if it starts with /, treat as root-level (strip /)
+# Otherwise, prepend PREFIX.
+resolve_path() {
+    local p="$1"
+    if [[ "$p" == /* ]]; then
+        # Absolute path - strip leading / and use as root-relative
+        echo "${p#/}"
+    else
+        # Relative path - prepend PREFIX
+        echo "${PREFIX}${PREFIX:+/}$p"
+    fi
+}
+
 # ── Subcommands ─────────────────────────────────────────────────
 
 cmd_read() {
@@ -59,7 +73,8 @@ cmd_read() {
         echo "usage: o read [-l] <path>" >&2
         exit 1
     fi
-    local path="${PREFIX}${PREFIX:+/}$1"
+    local path
+    path=$(resolve_path "$1")
     if $loop; then
         while true; do
             ollie-9p read "$path" || break
@@ -75,7 +90,8 @@ cmd_write() {
         exit 1
     fi
     local file="$1"; shift
-    local path="${PREFIX}${PREFIX:+/}$file"
+    local path
+    path=$(resolve_path "$file")
     if [[ $# -gt 0 ]]; then
         printf '%s\n' "$*" | ollie-9p write "$path"
     else
@@ -86,7 +102,7 @@ cmd_write() {
 cmd_ls() {
     local path="${PREFIX}"
     if [[ $# -ge 1 ]]; then
-        path="${PREFIX}${PREFIX:+/}$1"
+        path=$(resolve_path "$1")
     fi
     ollie-9p ls "$path"
 }
@@ -329,6 +345,9 @@ Context is determined by the first argument:
 
 The slash in <session>/<agent> disambiguates context level.
 
+Paths starting with / are root-relative (ignore context):
+  o myproj ls /bypass         List root bypass/ even in session context
+
 Commands (availability depends on context):
 
   Root level:
@@ -363,7 +382,7 @@ Examples:
   o myproj new coding         # create agent 'coding'
   o myproj/coding prompt      # interactive prompt
   o myproj/coding read chat   # read chat stream
-  o myproj/coding tui         # launch tmux TUI
+  o myproj/coding ls /bypass  # list root bypass/ from agent context
   o generate "explain monads" # one-shot, no session
 EOF
 }