test: update Codex tests for YAML frontmatter and $ARGUMENTS

Updates test assertions to match the new Codex format:
- YAML frontmatter with description and argument-hint fields
- $ARGUMENTS instead of positional $1 placeholders
- Verifies frontmatter is updated during openspec update

CHANGELOG.md

@@ -1,11 +1,5 @@
 # @fission-ai/openspec
 
-## 0.9.0
-
-### Minor Changes
-
-- efbbf3b: Add support for Codex and GitHub Copilot slash commands with YAML frontmatter and $ARGUMENTS
-
 ## Unreleased
 
 ### Minor Changes

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@fission-ai/openspec",
-  "version": "0.9.0",
+  "version": "0.8.1",
   "description": "AI-native system for spec-driven development",
   "keywords": [
     "openspec",

src/core/configurators/slash/codex.ts

@@ -6,9 +6,9 @@ import { FileSystemUtils } from "../../../utils/file-system.js";
 import { OPENSPEC_MARKERS } from "../../config.js";
 
 const FILE_PATHS: Record<SlashCommandId, string> = {
-  proposal: path.join(".codex", "prompts", "openspec-proposal.md"),
-  apply: path.join(".codex", "prompts", "openspec-apply.md"),
-  archive: path.join(".codex", "prompts", "openspec-archive.md"),
+  proposal: ".codex/prompts/openspec-proposal.md",
+  apply: ".codex/prompts/openspec-apply.md",
+  archive: ".codex/prompts/openspec-archive.md",
 };
 
 export class CodexSlashCommandConfigurator extends SlashCommandConfigurator {