remove grok.md support (#181)

.cursor/rules/project-overview.mdc

@@ -37,7 +37,7 @@ src/
 ├── utils/
 │   ├── settings.ts   # User and project settings
 │   ├── git-root.ts   # Resolve git repository root for AGENTS.md discovery
-│   └── instructions.ts # AGENTS.md (ecosystem) + .grok/GROK.md
+│   └── instructions.ts # AGENTS.md (ecosystem) custom instructions
 └── types/
     └── index.ts      # Shared TypeScript types
 ```
@@ -48,7 +48,7 @@ src/
 - **Bash-only tools**: The agent uses bash for everything (file editing, searching, git, builds, etc.).
 - **X Search & Web Search**: Integrated via the xAI Responses API for real-time information.
 - **Settings hierarchy**: Environment variables → User-level (`~/.grok/user-settings.json`) → Project-level (`.grok/settings.json`).
-- **Custom instructions**: `~/.grok/AGENTS.md`, then `AGENTS.override.md` / `AGENTS.md` per directory from git root through the workspace cwd (Codex-style merge), then `.grok/GROK.md` or `~/.grok/GROK.md` last.
+- **Custom instructions**: `~/.grok/AGENTS.md`, then `AGENTS.override.md` / `AGENTS.md` per directory from git root through the workspace cwd (Codex-style merge).
 - **ESM only**: The project uses `"type": "module"` — all imports use `.js` extensions for compiled output.
 
 ## Latest Grok Models

README.md

@@ -136,7 +136,6 @@ Treat the bot token like a password.
 ## Instructions & project brain
 
 - **`AGENTS.md`** — merged from git root down to your cwd (Codex-style; see repo docs). **`AGENTS.override.md`** wins per directory when present.
-- **`.grok/GROK.md`** or **`~/.grok/GROK.md`** — Grok-only rules, applied last.
 
 ---
 

src/utils/instructions.ts

@@ -29,12 +29,6 @@ function directoryChain(fromRoot: string, toCwd: string): string[] {
   return chain;
 }
 
-function loadGrokMd(cwd: string): string | null {
-  const projectPath = path.join(cwd, ".grok", "GROK.md");
-  const globalPath = path.join(os.homedir(), ".grok", "GROK.md");
-  return readNonEmptyFile(projectPath) ?? readNonEmptyFile(globalPath);
-}
-
 function loadAgentsSegments(canonicalCwd: string): string[] {
   const segments: string[] = [];
 
@@ -65,8 +59,6 @@ export function loadCustomInstructions(cwd: string): string | null {
   }
 
   const parts: string[] = [...loadAgentsSegments(canonical)];
-  const grok = loadGrokMd(canonical);
-  if (grok) parts.push(grok);
 
   if (parts.length === 0) return null;
   return parts.join("\n\n");