move hooks.json to plugin-root/hooks/, not under .claude-plugin/

Per https://code.claude.com/docs/en/plugins.md "Convert existing
configurations": the hooks config file goes at
`<plugin-root>/hooks/hooks.json` — sibling to the script files
under hooks/, NOT inside `.claude-plugin/`. v1.0.2 had it at
`.claude-plugin/hooks/hooks.json` (still 0 hooks loaded). v1.0.3
puts it at the actually-documented path.

Final layout:
  .claude-plugin/plugin.json
  hooks/hooks.json            ← event → command map
  hooks/hyprpanel-state.sh    ← the script

`${CLAUDE_PLUGIN_ROOT}` in `command` strings is case-sensitive and
correct.

hooks/hooks.json

@@ -0,0 +1,64 @@
+{
+	"hooks": {
+		"UserPromptSubmit": [
+			{
+				"hooks": [
+					{
+						"type": "command",
+						"command": "${CLAUDE_PLUGIN_ROOT}/hooks/hyprpanel-state.sh UserPromptSubmit"
+					}
+				]
+			}
+		],
+		"PreToolUse": [
+			{
+				"hooks": [
+					{
+						"type": "command",
+						"command": "${CLAUDE_PLUGIN_ROOT}/hooks/hyprpanel-state.sh PreToolUse"
+					}
+				]
+			}
+		],
+		"PostToolUse": [
+			{
+				"hooks": [
+					{
+						"type": "command",
+						"command": "${CLAUDE_PLUGIN_ROOT}/hooks/hyprpanel-state.sh PostToolUse"
+					}
+				]
+			}
+		],
+		"Notification": [
+			{
+				"hooks": [
+					{
+						"type": "command",
+						"command": "${CLAUDE_PLUGIN_ROOT}/hooks/hyprpanel-state.sh Notification"
+					}
+				]
+			}
+		],
+		"Stop": [
+			{
+				"hooks": [
+					{
+						"type": "command",
+						"command": "${CLAUDE_PLUGIN_ROOT}/hooks/hyprpanel-state.sh Stop"
+					}
+				]
+			}
+		],
+		"SessionEnd": [
+			{
+				"hooks": [
+					{
+						"type": "command",
+						"command": "${CLAUDE_PLUGIN_ROOT}/hooks/hyprpanel-state.sh SessionEnd"
+					}
+				]
+			}
+		]
+	}
+}