chore(gate): every lane reports how long it took, and a run can log the times for comparison

frontend/src/lib/gates.snapshot.json

@@ -1307,21 +1307,39 @@
       "export MSYS_NO_PATHCONV=1 # Git Bash: do not rewrite the in-container paths below",
       "TESTCOMPOSE=backend/docker-compose.test.yml",
       "failed=()",
+      "timings=()",
+      "ms() { date +%s%3N; }",
+      "secs() { awk -v t=\"$1\" 'BEGIN { printf \"%.1f\", t / 1000 }'; }",
+      "took=\"\"",
+      "timed() { # timed <name> <ok|red> <start-ms> — sets $took (no subshell: it must add to $timings)",
+      "  took=\"$(secs $(($(ms) - $3)))\"",
+      "  timings+=(\"$(printf '%8s s  %s' \"$took\" \"$1\")$([ \"$2\" = red ] && echo '  (red)')\")",
+      "  if [ -n \"${GATE_TIMES_FILE:-}\" ]; then",
+      "    printf '%s\\t%s\\t%s\\t%s\\t%s\\t%s\\n' \"$(date -u +%FT%TZ)\" \"$mode\" \"$1\" \"$took\" \"$2\" \\",
+      "      \"$(git rev-parse --short 'HEAD^{tree}' 2>/dev/null)\" >>\"$GATE_TIMES_FILE\"",
+      "  fi",
+      "  return 0",
+      "}",
       "lane() { # lane <name> <command…> — run it, remember a failure, never stop",
-      "  local name=\"$1\"",
+      "  local name=\"$1\" t0 result=ok",
       "  shift",
+      "  t0=\"$(ms)\"",
       "  if [ \"$brief\" = 0 ]; then",
       "    echo \">> $name…\"",
-      "    \"$@\" || failed+=(\"$name\")",
+      "    \"$@\" || { failed+=(\"$name\"); result=red; }",
+      "    timed \"$name\" \"$result\" \"$t0\"",
+      "    echo \"<< $name: $took s\"",
       "    return 0",
       "  fi",
       "  local out",
       "  out=\"$(mktemp)\"",
       "  if \"$@\" >\"$out\" 2>&1; then",
-      "    echo \">> $name: ok\"",
+      "    timed \"$name\" ok \"$t0\"",
+      "    echo \">> $name: ok ($took s)\"",
       "  else",
       "    failed+=(\"$name\")",
-      "    echo \">> $name: FAILED\"",
+      "    timed \"$name\" red \"$t0\"",
+      "    echo \">> $name: FAILED ($took s)\"",
       "    brief_excerpt \"$out\"",
       "  fi",
       "  rm -f \"$out\"",
@@ -1361,6 +1379,7 @@
       "  return 1",
       "}",
       "frontend() { (cd frontend && \"$@\"); }",
+      "gate_t0=\"$(ms)\"",
       "lane \"ruff\" ruff_check",
       "lane \"ruff format --check\" ruff_format",
       "lane \"basedpyright (new errors only)\" basedpyright",
@@ -1387,6 +1406,9 @@
       "  lane \"pip-audit (backend lock)\" pip_audit",
       "  lane \"npm audit (production dependencies)\" frontend npm audit --omit=dev --audit-level=high",
       "fi",
+      "echo \">> lane times:\"",
+      "printf '%s\\n' \"${timings[@]}\"",
+      "echo \"$(printf '%8s' \"$(secs $(($(ms) - gate_t0)))\") s  total\"",
       "if [ ${#failed[@]} -eq 0 ]; then",
       "  echo \">> gate ($mode): green ✓\"",
       "  exit 0",