Fix path-quoting in SessionStart check-config hook (handles spaces in CLAUDE_PLUGIN_ROOT)

If CLAUDE_PLUGIN_ROOT ever expands to a path containing whitespace
(e.g. ~/Library/Application Support/...), the unquoted ${CLAUDE_PLUGIN_ROOT}
in hooks/hooks.json word-splits and bash receives the path as multiple
arguments, failing with "No such file or directory" on the first split.

Quoting the expansion makes the invocation correct regardless of the
characters in the resolved path. Verified manually:
  unquoted + space  -> bash: /tmp/with: No such file or directory
  quoted   + space  -> bash: /tmp/with spaces/.../check-config.sh: No such file
  quoted   + real   -> /last30days: Ready - 7 sources active.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

hooks/hooks.json

@@ -6,7 +6,7 @@
         "hooks": [
           {
             "type": "command",
-            "command": "bash ${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check-config.sh",
+            "command": "bash \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check-config.sh\"",
             "timeout": 5
           }
         ]