chore: remove WALKTHROUGH.md from git (was ignored)

WALKTHROUGH.md

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-# Walkthrough: Import Skills from everything-claude-code
-
-## Overview
-
-Successfully imported 8 high-quality agentic skills from the [everything-claude-code](https://github.com/affaan-m/everything-claude-code) repository (Anthropic hackathon winner). Initially imported all types (agents, commands, rules), but corrected based on user feedback to strictly import only `skills/*.md`.
-
-## Changes Verified
-
-### 1. New Skills Added (8)
-
-The following skills were added to `skills/`:
-
-- `cc-skill-backend-patterns`
-- `cc-skill-clickhouse-io`
-- `cc-skill-coding-standards`
-- `cc-skill-continuous-learning`
-- `cc-skill-frontend-patterns`
-- `cc-skill-project-guidelines-example`
-- `cc-skill-security-review`
-- `cc-skill-strategic-compact`
-
-### 2. Documentation Updates
-
-- **README.md**:
-  - Updated total skill count to **233**.
-  - Added new entries to the "Full Skill Registry".
-  - Added credit to `affaan-m` in the Credits section.
-- **skills_index.json**:
-  - Regenerated using `scripts/generate_index.py`.
-  - Verified total count matches 233.
-
-### 3. Cleanup
-
-- Removed randomly imported Agent/Command/Rule directories (`cc-agent-*`, `cc-cmd-*`, `cc-rule-*`).
-- Ensured file system is clean.
-
-## Verification Results
-
-- **Skill Count Check**: PASSED (233)
-- **File System Check**: PASSED (No unwanted directories)
-- **Index Check**: PASSED (Synced with file system)
-
-## Next Steps
-
-- The skills are now ready for use by AI agents.
-- No further action required for this task.