Remove unused eslint-disable directives and update CLAUDE.md

- Remove unused @typescript-eslint/no-deprecated disable from eslint.config.ts
  (the directive was reporting as unused in CI)
- Remove no-var from context.ts disable (not needed - TypeScript parser handles it)
- Update CLAUDE.md to require running `yarn run eslint --report-unused-disable-directives`
  before every commit to match CI's exact check

This ensures local linting matches CI behavior exactly.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: justin808

CLAUDE.md

@@ -10,6 +10,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 2. **ALWAYS ensure files end with a newline character**
 3. **NEVER push without running full lint check first**
 4. **ALWAYS let Prettier and RuboCop handle ALL formatting - never manually format**
+5. **ALWAYS run `yarn run eslint --report-unused-disable-directives` before committing** - This matches CI's exact ESLint check
 
 These requirements are non-negotiable. CI will fail if not followed.
 
@@ -37,6 +38,7 @@ Pre-commit hooks automatically run:
   - All tests: `rake` (default task runs lint and all tests except examples)
 - **Linting** (MANDATORY BEFORE EVERY COMMIT):
   - **REQUIRED**: `bundle exec rubocop` - Must pass with zero offenses
+  - **REQUIRED**: `yarn run eslint --report-unused-disable-directives` - Must pass (matches CI exactly)
   - All linters: `rake lint` (runs ESLint and RuboCop)
   - ESLint only: `yarn run lint` or `rake lint:eslint`
   - RuboCop only: `rake lint:rubocop`

packages/react-on-rails/src/context.ts

@@ -2,10 +2,10 @@ import type { ReactOnRailsInternal, RailsContext } from './types/index.ts';
 
 declare global {
   // TypeScript requires 'var' (not 'let') in 'declare global' for proper global scope augmentation across modules
-  /* eslint-disable no-underscore-dangle, vars-on-top, no-var */
+  /* eslint-disable no-underscore-dangle, vars-on-top */
   var ReactOnRails: ReactOnRailsInternal | undefined;
   var __REACT_ON_RAILS_EVENT_HANDLERS_RAN_ONCE__: boolean;
-  /* eslint-enable no-underscore-dangle, vars-on-top, no-var */
+  /* eslint-enable no-underscore-dangle, vars-on-top */
 }
 
 let currentRailsContext: RailsContext | null = null;