spec-spine: Hook for Claude Code

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "command -v jq >/dev/null 2>&1 || { echo '[hook] jq missing, push gate and PR gate skipped'; exit 0; }\npayload=$(cat)\ncmd=$(printf '%s' \"$payload\" | jq -r '.tool_input.command // empty' 2>/dev/null)\nhookcwd=$(printf '%s' \"$payload\" | jq -r '.cwd // empty' 2>/dev/null)\n# The repo the command acts on, NOT the session's project: a multi-repo session\n# pushes and opens PRs in whichever tree the command names. Honour an explicit\n# `cd <dir>` prefix, else the hook's own cwd, then ask git for the toplevel.\ntarget=$(printf '%s' \"$cmd\" | sed -n 's/^[[:space:]]*cd[[:space:]]\\{1,\\}\\([^&;|]*\\).*/\\1/p' | head -1 | sed 's/[[:space:]]*$//')\ntarget=$(printf '%s' \"$target\" | sed \"s|^~|$HOME|\")\n[ -n \"$target\" ] || target=\"$hookcwd\"\n[ -n \"$target\" ] || target=.\nroot=$(git -C \"$target\" rev-parse --show-toplevel 2>/dev/null) || root=\"$target\"\n\ncase \"$cmd\" in\n  *'git push'*)\n    br=$(git -C \"$root\" branch --show-current 2>/dev/null); blk=0\n    case \"$cmd\" in *'origin main'|*'origin main '*|*'HEAD:main'|*'HEAD:main '*|*':main'|*':main '*|*'origin +main'*) blk=1 ;; esac\n    [ \"$br\" = main ] && blk=1\n    if [ \"$blk\" = 1 ]; then\n      { echo \"[push-gate] BLOCKED: pushing to main is refused (repo: $root, branch: ${br:-unknown}). Work on a feature branch and open a PR through /ship.\"; } >&2\n      exit 2\n    fi ;;\nesac\n\ncase \"$cmd\" in 'gh pr create'*|*'&& gh pr create'*|*'; gh pr create'*) ;; *) exit 0 ;; esac\n# Resolve the spec-spine binary for the repository this hook acts on:\n# $SPEC_SPINE_BIN, then that repository's own release build, then PATH. A repo\n# that builds its own binary must be governed by the one it builds; the PATH\n# fallback keeps an adopter on the published CLI working (spec 051).\nspec_spine_bin() {\n  if [ -n \"${SPEC_SPINE_BIN:-}\" ] && [ -x \"${SPEC_SPINE_BIN}\" ]; then echo \"${S