chore: remove duplicate assets dir and improve agent instructions

[yanurag-dev]

Summary

• Remove assets/GrepTurbo.md — it was a duplicate of internal/agentinit/GrepTurbo.md with no code referencing it, causing silent drift
• Add Go regex syntax section to agent instructions — AI agents trained on grep syntax would use \| instead of |, silently getting no results
• Clarify output format now returns relative paths (updated after feat: output relative paths in search results #23)

Test plan

• go build ./... passes
• go test ./... passes
• grepturbo init still writes correct GrepTurbo.md to ~/.claude/

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6601ce42-5bcc-436b-b06b-40d77ad7a841

📥 Commits

Reviewing files that changed from the base of the PR and between 4224ef9 and 2d60c61.

📒 Files selected for processing (2)

• assets/GrepTurbo.md
• internal/agentinit/GrepTurbo.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/cleanup-docs

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