fix: fix python SyntaxError in generate-baseline and stderr consistency

Replace def statement with inline re.search calls in the Makefile
generate-baseline target — Make collapses \<newline> into one line,
and def after a semicolon is a Python SyntaxError. Redirect error
messages in compare.sh to stderr for consistency.

EC-1819

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

Author: dheerajodha

Makefile

@@ -207,10 +207,10 @@ generate-baseline: benchmark/stress/data.tar.gz ## Generate stress benchmark bas
 	line = [l for l in open('benchmark-output.txt') if l.startswith('BenchmarkStress')]; \
 	line or sys.exit('No BenchmarkStress results found'); \
 	line = line[0]; \
-	def val(p): \
-	    m = re.search(p, line); \
-	    return m.group(1) if m else ''; \
-	ns = val(r'([\d.]+)\s+ns/op'); rss = val(r'([\d.]+)\s+peak-RSS-bytes'); \
+	ns_m = re.search(r'([\d.]+)\s+ns/op', line); \
+	rss_m = re.search(r'([\d.]+)\s+peak-RSS-bytes', line); \
+	ns = ns_m.group(1) if ns_m else ''; \
+	rss = rss_m.group(1) if rss_m else ''; \
 	(ns and rss) or sys.exit('Failed to parse benchmark metrics'); \
 	json.dump({'peak_rss_bytes': int(float(rss)), 'ns_per_op': int(float(ns)), \
 	  'components': int('$${EC_STRESS_COMPONENTS:-10}'), 'workers': int('$${EC_STRESS_WORKERS:-10}'), \

benchmark/stress/compare.sh

@@ -37,13 +37,13 @@ if [[ ! -f "$THRESHOLDS" ]]; then
 fi
 
 if [[ ! -f "$BENCHMARK_OUTPUT" ]]; then
-    echo "No benchmark output found at ${BENCHMARK_OUTPUT}"
+    echo "No benchmark output found at ${BENCHMARK_OUTPUT}" >&2
     exit 1
 fi
 
 line=$(grep '^BenchmarkStress' "$BENCHMARK_OUTPUT" || true)
 if [[ -z "$line" ]]; then
-    echo "No BenchmarkStress results found in output."
+    echo "No BenchmarkStress results found in output." >&2
     exit 1
 fi
 
@@ -66,7 +66,7 @@ print(ns, rss, b['ns_per_op'], b['peak_rss_bytes'], t['peak_rss_percent'], t['ns
 )
 
 if awk -v rss="$baseline_rss" -v ns="$baseline_ns" 'BEGIN {exit !(rss==0 || ns==0)}'; then
-    echo "Baseline contains zero values, cannot compute regression."
+    echo "Baseline contains zero values, cannot compute regression." >&2
     exit 1
 fi