fix(release): write package.json and pyproject.toml versions correctly

The single-quoted bash string passed to sed -i prevented FRONT_VERSION from
being interpolated, so the file content was being silently rewritten to
the literal text "${FRONT_VERSION}". Likewise the double-quoted sed for
pyproject.toml would silently do nothing if the [project] section was
absent while still printing a misleading 'updated' success line.

Replace both with python: json.load/dump for package.json (so the JSON
remains well-formed and 2-space-indented), and a regex section-aware
edit for pyproject.toml that exits non-zero with a warning if no
`version = "..."` line is found, so the success message only prints
when something actually changed.

Docker/release.sh

@@ -85,7 +85,20 @@ echo "Version file updated → ${VERSION_FILE}"
 FRONT_VERSION="${NEW_TAG#v}"
 FRONT_PKG="${SCRIPT_DIR}/../package.json"
 if [[ -f "${FRONT_PKG}" ]]; then
-    sed -i "s/\"version\": \"[^\"]*\"/\"version\": \"${FRONT_VERSION}\"/" "${FRONT_PKG}"
+    # Use a python one-liner for portable, safe JSON editing. The previous
+    # `sed -i` used single-quoted bash strings, which prevented
+    # ${FRONT_VERSION} from being interpolated and silently rewrote the file
+    # to the literal string "${FRONT_VERSION}".
+    python3 - "$FRONT_PKG" "$FRONT_VERSION" <<'PY'
+import json, sys
+path, new_version = sys.argv[1], sys.argv[2]
+with open(path, encoding="utf-8") as fh:
+    data = json.load(fh)
+data["version"] = new_version
+with open(path, "w", encoding="utf-8") as fh:
+    json.dump(data, fh, indent=2)
+    fh.write("\n")
+PY
     echo "package.json version updated → ${FRONT_VERSION}"
 else
     echo "Warning: package.json not found, skipping package.json version sync" >&2
@@ -94,13 +107,63 @@ fi
 # Keep root pyproject.toml in sync.
 BACKEND_PYPROJECT="${SCRIPT_DIR}/../pyproject.toml"
 if [[ -f "${BACKEND_PYPROJECT}" ]]; then
-    # Update version under [project] section if present
-    if grep -q '^\[project\]' "${BACKEND_PYPROJECT}"; then
-        sed -i "/^\[project\]/,/^\[/ s/^version = \".*\"/version = \"${FRONT_VERSION}\"/" "${BACKEND_PYPROJECT}"
-    else
-        sed -i "s/^version = \".*\"/version = \"${FRONT_VERSION}\"/" "${BACKEND_PYPROJECT}"
+    # Use python instead of sed: the previous `sed -i` used double-quoted
+    # patterns whose `&` and `\` characters would have to be escaped, and
+    # more importantly it could silently do nothing if the [project] section
+    # was missing. python reads/writes the file as a string, preserving
+    # the existing format, and reports whether anything changed.
+    if FRONT_VERSION="$FRONT_VERSION" BACKEND_PYPROJECT="$BACKEND_PYPROJECT" python3 <<'PY'
+import os, re, sys
+
+path = os.environ["BACKEND_PYPROJECT"]
+new_version = os.environ["FRONT_VERSION"]
+with open(path, encoding="utf-8") as fh:
+    text = fh.read()
+
+# If there is a [project] table, update only the `version = "..."` line
+# inside it; otherwise update the first top-level `version = "..."` line.
+project_match = re.search(r"^\[project\]\s*$", text, re.MULTILINE)
+if project_match:
+    start = project_match.end()
+    end = re.search(r"^\[", text[start:], re.MULTILINE)
+    section_end = start + end.start() if end else len(text)
+    section = text[start:section_end]
+    new_section, n = re.subn(
+        r'^version = ".*"$',
+        f'version = "{new_version}"',
+        section,
+        count=1,
+        flags=re.MULTILINE,
+    )
+    if n == 0:
+        print(
+            f"Warning: no `version = ...` line found under [project] in {path}",
+            file=sys.stderr,
+        )
+        sys.exit(2)
+    text = text[:start] + new_section + text[section_end:]
+else:
+    new_text, n = re.subn(
+        r'^version = ".*"$',
+        f'version = "{new_version}"',
+        text,
+        count=1,
+        flags=re.MULTILINE,
+    )
+    if n == 0:
+        print(
+            f"Warning: no `version = ...` line found in {path}",
+            file=sys.stderr,
+        )
+        sys.exit(2)
+    text = new_text
+
+with open(path, "w", encoding="utf-8") as fh:
+    fh.write(text)
+PY
+    then
+        echo "pyproject.toml version updated → ${FRONT_VERSION}"
     fi
-    echo "pyproject.toml version updated → ${FRONT_VERSION}"
 else
     echo "Warning: pyproject.toml not found, skipping pyproject.toml version sync" >&2
 fi