feat: add multi-runtime support (coord run, prdy --codex) and next-task capsule

- coord/prdy subcommands now accept --claude/--codex runtime flags
- New `mosaic coord run` generates continuation context and launches
  selected runtime, replacing manual copy/paste workflow
- Next-task capsule (.mosaic/orchestrator/next-task.json) provides
  machine-readable execution context for deterministic session launches
- Codex strict orchestrator profile added to runtime/codex/RUNTIME.md
- Orchestrator protocol updated with between-session run flow
- New smoke-test.sh for orchestration behavior verification

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tools/orchestrator/session-status.sh

@@ -33,6 +33,8 @@ while [[ $# -gt 0 ]]; do
 done
 
 _require_jq
+runtime_cmd="$(coord_launch_command)"
+run_cmd="$(coord_run_command)"
 
 # ─── Check session lock ─────────────────────────────────────────────────────
 
@@ -103,8 +105,9 @@ if ! lock_data="$(session_lock_read "$PROJECT")"; then
 
       if [[ "$m_status" == "active" || "$m_status" == "paused" ]]; then
         echo -e "  ${C_BOLD}Next steps:${C_RESET}"
+        echo "    $run_cmd                 Auto-generate context and launch"
         echo "    mosaic coord continue     Generate continuation prompt"
-        echo "    mosaic yolo claude        Launch agent session"
+        echo "    $runtime_cmd              Launch agent session"
       elif [[ "$m_status" == "completed" ]]; then
         echo -e "  ${C_DIM}Mission completed. Start a new one with: mosaic coord init${C_RESET}"
       else