Fix JSON parsing in _serial_redfish_request when terminal wraps long curl commands

The serial terminal echoes the curl command back before executing it.
The -w format string contains '%{http_code}' which includes a literal '{'.
When the terminal wraps long command lines (IOM2's path is ~70 chars),
that '{' can land at a line boundary, causing find("{") to pick up the
wrong position and produce garbled JSON/error output.

Fix: narrow the JSON search to the text before the HTTP_CODE: marker,
then use rfind("\n{") to find the last newline-prefixed '{'. The actual
curl response always starts on its own line, while the echoed '{http_code}'
is embedded mid-line in the command echo — so rfind("\n{") reliably skips it.

Also tighten the error snippet to use the same search_area bounds so the
displayed error shows actual response content rather than command echo text.

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

modules/workflow_serial.py

@@ -161,6 +161,8 @@ def _serial_redfish_request(ser: SerialPort, password: str, method: str,
     raw = _ANSI_RE.sub("", ser.read_until_quiet(quiet_period=1.5, timeout=30.0))
 
     # ── Parse HTTP status code ─────────────────────────────────────────────────
+    # Use the LAST occurrence of HTTP_CODE: so the echoed curl -w argument
+    # (which also contains the literal text "HTTP_CODE:") doesn't interfere.
     http_code = 0
     if "HTTP_CODE:" in raw:
         try:
@@ -168,13 +170,34 @@ def _serial_redfish_request(ser: SerialPort, password: str, method: str,
         except ValueError:
             pass
 
-    # ── Extract JSON body (outermost { ... }) ──────────────────────────────────
+    # ── Extract JSON body ──────────────────────────────────────────────────────
+    # The terminal echoes the curl command before executing it, and the
+    # -w format string contains '%{http_code}' which includes a literal '{'.
+    # When the terminal wraps long command lines, that '{' can land at a
+    # line boundary, causing find("{") to return the wrong position.
+    #
+    # Strategy: narrow the search to the text before HTTP_CODE: (the actual
+    # curl response body appears there), then find the LAST newline-prefixed
+    # '{' — because the JSON response always starts on its own line, while
+    # the echoed '{http_code}' is embedded mid-line in the curl command echo.
+    http_code_pos = raw.find("HTTP_CODE:")
+    search_area   = raw[:http_code_pos].rstrip() if http_code_pos >= 0 else raw
+
     data: dict = {}
-    json_start = raw.find("{")
+    json_end = search_area.rfind("}") + 1
-    json_end   = raw.rfind("}") + 1
+    if json_end > 0:
-    if json_start >= 0 and json_end > json_start:
+        json_start = -1
+        for nl in ("\r\n", "\n"):
+            pos = search_area.rfind(nl + "{")
+            if pos >= 0:
+                json_start = pos + len(nl)
+                break
+        if json_start < 0:
+            json_start = search_area.find("{")   # fallback if no newline found
+
+        if json_start >= 0:
             try:
-            data = json.loads(raw[json_start:json_end])
+                data = json.loads(search_area[json_start:json_end])
             except json.JSONDecodeError:
                 pass
 
@@ -182,7 +205,8 @@ def _serial_redfish_request(ser: SerialPort, password: str, method: str,
     if http_code >= 400:
         msg = (data.get("error", {}).get("message", "")
                if isinstance(data, dict) else "")
-        return False, f"HTTP {http_code}: {msg or raw[json_start:json_start+120]}"
+        snippet = search_area[json_start:json_start + 120] if json_start >= 0 else search_area[-120:]
+        return False, f"HTTP {http_code}: {msg or snippet}"
 
     if http_code >= 200 or data:
         return True, data