refactor: Remove timeout_minutes parameter from action (#482)

This change removes the custom timeout_minutes parameter from the action in favor of using GitHub Actions' native timeout-minutes feature.

Changes:
- Removed timeout_minutes input from action.yml and base-action/action.yml
- Removed all timeout handling logic from base-action/src/run-claude.ts
- Updated base-action/src/index.ts to remove timeoutMinutes parameter
- Removed timeout-related tests from base-action/test/run-claude.test.ts
- Removed timeout_minutes from all example workflow files (19 files)

Rationale:
- Simplifies the codebase by removing custom timeout logic
- Users can use GitHub Actions' native timeout-minutes at the job/step level
- Reduces complexity and maintenance burden
- Follows GitHub Actions best practices

BREAKING CHANGE: The timeout_minutes parameter is no longer supported. Users should use GitHub Actions' native timeout-minutes instead.

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

Co-authored-by: Claude <noreply@anthropic.com>

.github/workflows/test-base-action.yml

@@ -25,7 +25,6 @@ jobs:
           prompt: ${{ github.event.inputs.test_prompt || 'List the files in the current directory starting with "package"' }}
           anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
           allowed_tools: "LS,Read"
-          timeout_minutes: "3"
 
       - name: Verify inline prompt output
         run: |
@@ -83,7 +82,6 @@ jobs:
           prompt_file: "test-prompt.txt"
           anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
           allowed_tools: "LS,Read"
-          timeout_minutes: "3"
 
       - name: Verify prompt file output
         run: |