chore: remove ultrathink mode section from CLAUDE.md

[limichange]

Summary

• Removed the "Ultrathink Mode for Complex Operations" section from CLAUDE.md, including the trigger conditions, analysis framework, and quality gate requirements subsections.

Intent & Context

User requested removal of the ultrathink mode description from the project's CLAUDE.md. The ultrathink instruction is already configured in the user's global ~/.claude/CLAUDE.md, making the project-level copy redundant.

Changes Detail

• CLAUDE.md: Removed 27 lines covering the "CRITICAL: Ultrathink Mode for Complex Operations" section, the "Ultrathink Analysis Framework" subsection, and the "Quality Gate Requirements" subsection.

Risk Assessment

• Risk Level: Low
• Affected Platforms: None (documentation only)

Test plan

• Verify CLAUDE.md renders correctly without the removed section

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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[revan-zhang]

✅ Snyk checks have passed. No issues have been found so far.

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