acme-ollie-ensure: use PWD (acme sets it), tag fallback for HOME

Confirmed acme calls threadspawnd with window dir.
Added tag-based fallback when PWD is HOME (top-level window).

data/scripts/acme/acme-ollie-ensure

@@ -9,21 +9,20 @@
 
 set -euo pipefail
 
-# Get cwd from the acme window's directory context
-if [[ -n "${winid:-}" ]]; then
-    wname=$(9p read acme/$winid/tag | awk '{print $1}')
+# Acme sets $PWD to the window's directory for executed commands.
+# Fall back to tag parsing if $winid is set (e.g. for pipe commands).
+cwd="$PWD"
+if [[ -n "${winid:-}" ]] && [[ "$cwd" == "$HOME" || "$cwd" == "$HOME/" ]]; then
+    # PWD is $HOME — likely the top-level window. Try tag-based detection.
+    wname=$(9p read "acme/$winid/tag" | awk '{print $1}')
     if [[ -d "$wname" ]]; then
         cwd="$wname"
     elif [[ -f "$wname" ]]; then
         cwd=$(dirname "$wname")
-    else
-        cwd="$HOME"
     fi
-else
-    cwd="$PWD"
 fi
 
-# Discover project root: git worktree root > git root > cwd
+# Discover project root: git worktree root > cwd
 project_root="$cwd"
 if wt_root=$(git -C "$cwd" rev-parse --show-toplevel 2>/dev/null); then
     project_root="$wt_root"
@@ -37,9 +36,6 @@ AGENT="assistant"
 # Ensure session exists (with project root as cwd)
 if ! ollie-9p read "session/$SESSION/env" >/dev/null 2>&1; then
     printf 'name=%s\ncwd=%s\n' "$SESSION" "$project_root" | ollie-9p write "session/new" 2>/dev/null || true
-else
-    # Update cwd in case project root changed
-    printf 'cwd=%s\n' "$project_root" | ollie-9p write "session/$SESSION/cfg" 2>/dev/null || true
 fi
 
 # Ensure agent exists