recovery: give the incident tooling a permanent home (scripts/recovery/)

The 2026-08-03 cc-ci outage was recovered with ad-hoc tooling living in /tmp
(leftover from a PREVIOUS incident, half-evaporated). Promoted to the repo:
- scripts/recovery/hetzner.py — Hetzner API helper (status/actions/reboot/reset/
  power/rescue-on|off/console), knows cc-ci=134485294 + orchestrator=134487234 by
  name; token from HCLOUD_TOKEN or /srv/cc-ci/.hcloud-token (0600, never in git).
- scripts/recovery/hetzner-console.sh — shell-only VGA console: fresh console
  session -> websocat bridge -> vncdotool (venv auto-bootstrapped in ~/.cache).
  screenshot / key / type subcommands; encodes the reset-invalidates-session and
  single-connection-bridge gotchas.
- scripts/recovery/README.md — the condensed 10-minute unreachable-server drill,
  incl. the GRUB submenu 1>N ids + clear-grubenv-after-switch rule.
- hetzner-server-recovery skill: console/API sections now point at the repo tools
  instead of describing /tmp rebuilds.
Smoke-tested: hetzner.py cc-ci status OK.

scripts/recovery/hetzner-console.sh

@@ -0,0 +1,76 @@
+#!/usr/bin/env bash
+# hetzner-console.sh — drive a Hetzner web-console (raw VNC over websocket) from a shell.
+# The screenshot/keyboard half of hetzner-server-recovery; proven in the 2026-08-03
+# cc-ci 26.05 outage (console screenshots identified the wrong-generation boot).
+#
+# Usage:
+#   hetzner-console.sh <server> screenshot <out.png>
+#   hetzner-console.sh <server> key <key> [key ...]     # e.g. key Down Down Return
+#   hetzner-console.sh <server> type "<text>"
+#
+# <server> = name/id understood by hetzner.py. Each invocation requests a FRESH console
+# session (they are cheap, and hard resets invalidate old ones), bridges it to a local
+# TCP port with websocat, and runs vncdo against it. The bridge is single-connection —
+# that is why every command re-requests + re-bridges.
+#
+# Gotchas encoded here so nobody rediscovers them at 2am:
+# - The wss_url from the API contains literal '&' — when it arrives via JSON it may be
+#   &-escaped; parse the JSON properly (as below), never paste from raw output.
+# - A hard `reset` drops the console websocket mid-session: re-request and reconnect.
+# - GRUB menus: generations live in a SUBMENU — one-shot boot ids are "1>N", and any
+#   persistent grubenv `default` must be cleared after the next switch regenerates
+#   grub.cfg (indices shift). See the hetzner-server-recovery skill.
+set -o errexit -o nounset -o pipefail
+
+HERE="$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")"
+SERVER="${1:?usage: hetzner-console.sh <server> screenshot|key|type ...}"
+CMD="${2:?need a command: screenshot|key|type}"
+shift 2
+
+PORT="${CONSOLE_PORT:-5905}"
+VENV="${HOME}/.cache/hetzner-console-venv"
+
+# 1. vncdotool venv (bootstrap once; durable across incidents, unlike /tmp)
+if [ ! -x "${VENV}/bin/vncdo" ]; then
+  echo "bootstrapping vncdotool venv at ${VENV}..." >&2
+  python3 -m venv "${VENV}"
+  "${VENV}/bin/pip" -q install vncdotool
+fi
+
+# 2. fresh console session
+CREDS="$(python3 "${HERE}/hetzner.py" "${SERVER}" console)"
+WSS="$(printf '%s' "${CREDS}" | python3 -c 'import json,sys; print(json.load(sys.stdin)["wss_url"])')"
+PW="$(printf '%s' "${CREDS}" | python3 -c 'import json,sys; print(json.load(sys.stdin)["password"])')"
+
+# 3. bridge (single-connection; killed on exit)
+pkill -f "websocat.*${PORT}" 2>/dev/null || true
+sleep 0.5
+nix shell nixpkgs#websocat -c websocat --binary "tcp-listen:127.0.0.1:${PORT}" "${WSS}" \
+  > /tmp/hetzner-console-websocat.log 2>&1 &
+BRIDGE=$!
+trap 'kill ${BRIDGE} 2>/dev/null || true; pkill -f "websocat.*${PORT}" 2>/dev/null || true' EXIT
+sleep 2
+
+# 4. run the vncdo command
+case "${CMD}" in
+  screenshot)
+    OUT="${1:?screenshot needs an output path}"
+    timeout 40 "${VENV}/bin/vncdo" -s "127.0.0.1::${PORT}" -p "${PW}" capture "${OUT}"
+    echo "captured ${OUT}"
+    ;;
+  key)
+    [ $# -ge 1 ] || { echo "key needs at least one key name" >&2; exit 1; }
+    ARGS=()
+    for k in "$@"; do ARGS+=(key "$k" pause 0.3); done
+    timeout 60 "${VENV}/bin/vncdo" -s "127.0.0.1::${PORT}" -p "${PW}" "${ARGS[@]}"
+    echo "sent: $*"
+    ;;
+  type)
+    TEXT="${1:?type needs text}"
+    timeout 60 "${VENV}/bin/vncdo" -s "127.0.0.1::${PORT}" -p "${PW}" type "${TEXT}"
+    echo "typed"
+    ;;
+  *)
+    echo "unknown command ${CMD} (screenshot|key|type)" >&2; exit 1
+    ;;
+esac