Implement native fast iterative deploy workflow

deployment/native/rollback.sh

@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ $# -lt 1 || $# -gt 2 ]]; then
+  echo "Usage: deployment/native/rollback.sh <git-ref> [full|web|api|services|workers]" >&2
+  exit 1
+fi
+
+ref="$1"
+scope="${2:-services}"
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+
+cd "$repo_root"
+
+if [[ -n "$(git status --porcelain=v1)" ]]; then
+  echo "Refusing rollback with a dirty working tree." >&2
+  exit 1
+fi
+
+current_ref="$(git rev-parse --short HEAD)"
+echo "Rolling back from $current_ref to $ref (scope: $scope)"
+
+git fetch --all --prune
+git switch --detach "$ref"
+bun install --frozen-lockfile
+
+if [[ "$scope" == "full" || "$scope" == "web" ]]; then
+  bun --cwd=apps/web run build
+fi
+
+case "$scope" in
+  full)
+    units=(islandflow-web.service islandflow-api.service islandflow-compute.service islandflow-candles.service islandflow-ingest-options.service islandflow-ingest-equities.service)
+    ;;
+  web)
+    units=(islandflow-web.service)
+    ;;
+  api)
+    units=(islandflow-api.service)
+    ;;
+  services)
+    units=(islandflow-api.service islandflow-compute.service islandflow-candles.service islandflow-ingest-options.service islandflow-ingest-equities.service)
+    ;;
+  workers)
+    units=(islandflow-compute.service islandflow-candles.service islandflow-ingest-options.service islandflow-ingest-equities.service)
+    ;;
+  *)
+    echo "Unknown scope: $scope" >&2
+    exit 1
+    ;;
+esac
+
+systemctl --user restart "${units[@]}"
+"$repo_root/deployment/native/check-native-health.sh" "$scope"
+
+echo "Rollback complete. Repo is now detached at $(git rev-parse --short HEAD)."
+echo "Return to tracked main later with: git switch main && git pull --ff-only <remote> main"