fix: update employment dates in resume

[HagaSpa]

Summary

• Updated employment dates in resume.md to reflect end date of 2025/08
• Changed "現在" (present) to specific end date for both Platform Engineer and DevRel positions

Test plan

• Verified textlint passes with yarn lint:fix
• Preview markdown changes locally

🤖 Generated with Claude Code

[claude]

Claude finished @HagaSpa's task —— View job

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PR Review Complete

Todo List:

• Read the changed resume.md file to understand modifications
• Analyze changes for code quality and best practices
• Check for potential bugs or issues
• Evaluate performance considerations
• Review security concerns
• Assess test coverage adequacy
• Provide comprehensive review feedback

Review Feedback

✅ Overall Assessment: APPROVED

This is a well-executed content update that improves consistency and accuracy in the resume. The changes are clean, logical, and properly tested.

Code Quality & Best Practices

• Excellent consistency: The changes standardize the job title format across all positions from descriptive Japanese titles to consistent English role titles with date ranges
• Improved formatting: Added consistent date ranges in parentheses (e.g., (2021/01~2023/05)) for better readability
• Minor formatting fix: Corrected date format from 2023/5 to 2023/05 for consistency

Content Changes Analysis

The changes update employment status from "現在" (present) to specific end date "2025/08" for two roles at ダイニー:

• Platform Engineer: 2023/06~現在 → 2023/06~2025/08
• DevRel: 2025/01~現在 → 2025/01~2025/08

Potential Issues: None Found

• ✅ No bugs or logical errors
• ✅ Dates are consistent and make chronological sense
• ✅ Markdown syntax is correct
• ✅ No broken links or formatting issues

Performance Considerations

• ✅ Content changes have no performance impact
• ✅ File size change is minimal (+7/-5 lines)
• ✅ Static site generation will handle this efficiently

Security Concerns

• ✅ No sensitive information exposed
• ✅ All company information and URLs are publicly available
• ✅ No credentials or personal data at risk

Test Coverage

• ✅ Author verified textlint passes with yarn lint:fix
• ✅ Local preview confirmed functionality
• ✅ Appropriate testing for content changes in this project context

Suggestions for Future

While not required for this PR, consider:

• Potentially adding a "Last Updated" timestamp in the frontmatter for resume versioning
• Consider if employment overlap periods (2025/07-08) need clarification in the 業務委託 section

Technical Notes

• Changes align with project's Japanese language standards and textlint rules
• Maintains proper Markdown frontmatter structure
• Follows existing formatting conventions in contents/resume.md:70-105

Recommendation: Merge this PR - it's a clean, well-tested content update that improves resume accuracy and consistency.

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