fix(rules-injector): respect claude_code config for user rule loading

When claude_code integration is disabled in oh-my-opencode.json, the
rules-injector now skips loading rules from ~/.claude/rules/ to prevent
Claude Code-specific instructions from leaking into non-Claude agents
(e.g., GPT-5.4 Sisyphus), which causes agent hallucination.

Also adds ~/.sisyphus/rules/ and ~/.opencode/rules/ as OpenCode-native
user rule directories that are always searched regardless of config.

Fixes #2920

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/plugin/hooks/create-tool-guard-hooks.ts

@@ -91,9 +91,15 @@ export function createToolGuardHooks(args: {
     ? safeHook("empty-task-response-detector", () => createEmptyTaskResponseDetectorHook(ctx))
     : null
 
+  const claudeCodeDisabled = pluginConfig.claude_code
+    && !pluginConfig.claude_code.hooks
+    && !pluginConfig.claude_code.skills
+    && !pluginConfig.claude_code.agents
   const rulesInjector = isHookEnabled("rules-injector")
     ? safeHook("rules-injector", () =>
-        createRulesInjectorHook(ctx, modelCacheState))
+        createRulesInjectorHook(ctx, modelCacheState, {
+          skipClaudeUserRules: claudeCodeDisabled ?? false,
+        }))
     : null
 
   const tasksTodowriteDisabler = isHookEnabled("tasks-todowrite-disabler")