Shell-quote hook command paths and reject ambiguous verdict lines

Hook installer now shell-quotes command paths via shlex.quote() so
runtime roots containing spaces do not split the command at execution.

Mainline verdict parser rejects lines with multiple verdict keywords
as unknown to prevent template placeholders from being parsed as a
valid verdict.

Corrected Gemini CLI install guidance to the actual package and repo.

Author: SihaoLiu

scripts/install-codex-hooks.sh

@@ -95,6 +95,7 @@ merge_hooks_json() {
 import json
 import pathlib
 import re
+import shlex
 import sys
 
 hooks_file = pathlib.Path(sys.argv[1])
@@ -108,6 +109,14 @@ escaped_root = json.dumps(runtime_root)[1:-1]  # strip outer quotes from dumps o
 template_text = template_text.replace("{{HUMANIZE_RUNTIME_ROOT}}", escaped_root)
 template = json.loads(template_text)
 
+# Shell-quote command paths so spaces in runtime_root do not split the command
+for group_list in template.get("hooks", {}).values():
+    for group in group_list:
+        if isinstance(group, dict):
+            for hook in group.get("hooks", []):
+                if isinstance(hook, dict) and "command" in hook:
+                    hook["command"] = shlex.quote(hook["command"])
+
 existing = {}
 if hooks_file.exists():
     with hooks_file.open("r", encoding="utf-8") as fh: