refactor(packages): rename rules-core to rules-engine

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

packages/agents-md-core/package.json

@@ -16,7 +16,7 @@
     "test": "bun test src/*.test.ts"
   },
   "dependencies": {
-    "@oh-my-opencode/rules-core": "workspace:*",
+    "@oh-my-opencode/rules-engine": "workspace:*",
     "@oh-my-opencode/utils": "workspace:*"
   }
 }

packages/agents-md-core/src/finder.ts

@@ -1,6 +1,6 @@
 import {
   findAgentsMdUp as findAgentsMdUpCore,
-} from "@oh-my-opencode/rules-core";
+} from "@oh-my-opencode/rules-engine";
 import { isAbsolute, resolve } from "node:path";
 
 import type { AgentsMdDiscoveryInput } from "./types";

packages/agents-md-core/src/injector.ts

@@ -1,4 +1,4 @@
-import type { AgentsMdCache } from "@oh-my-opencode/rules-core";
+import type { AgentsMdCache } from "@oh-my-opencode/rules-engine";
 import { promises as fsPromises } from "node:fs";
 import { dirname } from "node:path";
 

packages/agents-md-core/src/types.ts

@@ -1,4 +1,4 @@
-import type { AgentsMdCache } from "@oh-my-opencode/rules-core";
+import type { AgentsMdCache } from "@oh-my-opencode/rules-engine";
 
 export interface TruncationResult {
   readonly result: string;

packages/rules-engine/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@oh-my-opencode/rules-core",
+  "name": "@oh-my-opencode/rules-engine",
   "version": "0.1.0",
   "type": "module",
   "private": true,