feat: standardize Deep Thinking prompt metadata for MCP and CLI

[kamran-nizamani]

Summary

This PR standardizes metadata for "Deep Thinking" system prompts to improve discoverability in MCP server and CLI tools.

Changes

• Added [SYSTEM][DEEP_THINKING] tag to identify advanced reasoning prompts
• Ensures consistent classification of system-level prompts vs normal prompts
• No structural changes to CSV format

Why this change

Improves prompt categorization for CLI and MCP tools so they can better detect and suggest reasoning-heavy prompts.

Example

Before:
"Act as a comprehensive decision-making system..."

After:
"[SYSTEM][DEEP_THINKING] Act as a comprehensive decision-making system..."

Notes

• No breaking changes
• Fully backward compatible

[coderabbitai]

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