fix: remove stale eslint-config references breaking changeset release

The @copilotkit/eslint-config and eslint-config-custom packages were
removed from the workspace but still referenced in changeset files,
causing `changeset version` to fail during release CI.

- Remove @copilotkit/eslint-config from consolidate-v1-v2-packages changeset
- Remove @copilotkit/eslint-config and eslint-config-custom from pre.json initialVersions
- Remove dead eslint-config-custom link from cursor rules

https://claude.ai/code/session_012W65KcXxEaCYnjcSKBHw4x

Author: claude

.changeset/consolidate-v1-v2-packages.md

@@ -2,7 +2,6 @@
 "@copilotkit/a2ui-renderer": minor
 "@copilotkit/core": minor
 "@copilotkit/demo-agents": minor
-"@copilotkit/eslint-config": minor
 "@copilotkit/react-core": minor
 "@copilotkit/react-textarea": minor
 "@copilotkit/react-ui": minor

.changeset/pre.json

@@ -25,7 +25,6 @@
     "@copilotkit-storybook/react": "0.0.0",
     "@copilotkit/a2ui-renderer": "1.54.0",
     "copilotkit": "0.0.59",
-    "eslint-config-custom": "1.4.12",
     "@copilotkit/react-core": "1.54.0",
     "@copilotkit/react-textarea": "1.54.0",
     "@copilotkit/react-ui": "1.54.0",
@@ -38,7 +37,6 @@
     "@copilotkit/angular": "1.54.0",
     "@copilotkit/core": "1.54.0",
     "@copilotkit/demo-agents": "1.54.0",
-    "@copilotkit/eslint-config": "1.54.0",
     "@copilotkit/sqlite-runner": "1.54.0",
     "@copilotkit/typescript-config": "1.54.0",
     "@copilotkit/voice": "1.54.0",

.cursor/rules/development-workflow.mdc

@@ -41,8 +41,7 @@ Located in [scripts/](mdc:scripts):
 ## Configuration Files
 - **[CopilotKit.code-workspace](mdc:CopilotKit.code-workspace)** - VS Code workspace settings
 - **[utilities/](mdc:utilities)** - Shared utilities:
-  - [eslint-config-custom/](mdc:utilities/eslint-config-custom) - ESLint configuration
-  - [tailwind-config/](mdc:utilities/tailwind-config) - Tailwind CSS configuration  
+  - [tailwind-config/](mdc:utilities/tailwind-config) - Tailwind CSS configuration
   - [tsconfig/](mdc:utilities/tsconfig) - TypeScript configurations
 
 ## Infrastructure