dev-orchestrator: decouple spec scaffold from fill, delegate exploration to OpenSpec native /opsx commands

- cmd_spec now only scaffolds (OpenSpec change + worktree + deps), no auto-fill
- Added cmd_fill as fallback for headless spec filling
- Output guides user to /opsx:explore and /opsx:continue inside OpenCode
- cmd_build (dev→QA loop) unchanged — core value proposition

tooling/dev-orchestrator

@@ -71,8 +71,27 @@ cmd_spec() {
         (cd "$wt" && [ -d .venv ] || python3 -m venv .venv && . .venv/bin/activate && pip install -e . -q 2>&1 | tail -1) || true
     fi
 
-    # ── orchestrator fills the spec ──
-    echo "── Orchestrator filling spec ──"
+    echo ""
+    _ok "Spec '$name' scaffolded at openspec/changes/$name/"
+    echo "   Worktree: $wt"
+    echo ""
+    echo "   ── Next: explore in OpenCode ──"
+    echo "   opencode"
+    echo "   Then use OpenSpec native commands:"
+    echo "     /opsx:explore   — discuss the feature, refine requirements"
+    echo "     /opsx:continue  — fill spec artifacts one by one"
+    echo ""
+    echo "   After specs are filled → dev-orchestrator build $name"
+}
+
+cmd_fill() {
+    local name="$1"
+    _guard
+
+    local wt="$(_wt_path "$name")"
+    [ -d "openspec/changes/$name" ] || _die "spec not found: openspec/changes/$name. Run: dev-orchestrator spec $name"
+
+    echo "── AI filling spec from conversation context ──"
     opencode run \
         "You are filling an OpenSpec change for feature: $name.
 
@@ -91,8 +110,7 @@ cmd_spec() {
         --workdir "$REPO"
 
     echo ""
-    _ok "Spec '$name' ready at openspec/changes/$name/"
-    echo "   Worktree: $wt"
+    _ok "Spec '$name' filled at openspec/changes/$name/"
     echo "   Review the spec, then: dev-orchestrator build $name"
 }
 
@@ -247,6 +265,10 @@ case "${1:-}" in
         [ $# -ge 2 ] || _die "usage: dev-orchestrator spec <feature-name>"
         cmd_spec "$2"
         ;;
+    fill)
+        [ $# -ge 2 ] || _die "usage: dev-orchestrator fill <feature-name>"
+        cmd_fill "$2"
+        ;; 
     build)
         [ $# -ge 2 ] || _die "usage: dev-orchestrator build <feature-name>"
         cmd_build "$2"
@@ -263,12 +285,13 @@ case "${1:-}" in
         echo ""
         echo "commands:"
         echo "  init                       Set up repo (run once per project)"
-        echo "  spec   <feature-name>      Create OpenSpec + worktree + fill spec"
+        echo "  spec   <feature-name>      Scaffold OpenSpec + worktree (no fill)"
+        echo "  fill   <feature-name>      AI fills spec after exploration"
         echo "  build  <feature-name>      Dev→QA loop in isolated worktree"
         echo "  status                     Kanban view of features in flight"
         echo "  clean  <feature-name>      Remove worktree + branch"
         echo ""
-        echo "flow: init → spec → [review] → build → [loop until QA passes]"
+        echo "flow: init → spec → [explore in OpenCode] → fill → build → [QA loop]"
         echo ""
         echo "worktrees live at: ../.worktrees/<feature>/"
         echo "branches named:    dev-flow/<feature>"