feat: Add sql-query-explainer kit

[Saadonweb]

PR Checklist

1. Select Contribution Type

• Kit (kits/<category>/<kit-name>/)
• Bundle (bundles/<bundle-name>/)
• Template (templates/<template-name>/)

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2. General Requirements

• PR is for one project only (no unrelated changes)
• No secrets, API keys, or real credentials are committed
• Folder name uses kebab-case and matches the flow ID
• All changes are documented in README.md (purpose, setup, usage)

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3. File Structure (Check what applies)

• config.json present with valid metadata (name, description, tags, steps, author, env keys)
• All flows in flows/<flow-name>/ (where applicable) include:
  • config.json (Lamatic flow export)
  • inputs.json
  • meta.json
  • README.md
• .env.example with placeholder values only (kits only)
• No hand‑edited flow config.json node graphs (changes via Lamatic Studio export)

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4. Validation

• npm install && npm run dev works locally (kits: UI runs; bundles/templates: flows are valid)
• PR title is clear (e.g., [kit] Add <name> for <use case>)
• GitHub Actions workflows pass (all checks are green)
• All CodeRabbit or other PR review comments are addressed and resolved
• No unrelated files or projects are modified

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[github-actions]

PR Validation Results

New Contributions Detected

• Kit: kits/sql-query-explainer/prompts
• Kit: kits/sql-query-explainer/model-configs
• Kit: kits/sql-query-explainer/lamatic.config.ts
• Kit: kits/sql-query-explainer/README.md
• Kit: kits/sql-query-explainer/.gitignore
• Kit: kits/sql-query-explainer/flows
• Kit: kits/sql-query-explainer/agent.md

Check Results

Check	Status
No edits to existing projects	✅ Pass
Required root files present	❌ Fail
Flow folder structure valid	✅ Pass
No changes outside contribution dirs	✅ Pass

Errors

• ❌ Missing config.json in kits/sql-query-explainer/prompts
• ❌ Missing README.md in kits/sql-query-explainer/prompts
• ❌ Missing flows/ directory in kits/sql-query-explainer/prompts
• ❌ Missing config.json in kits/sql-query-explainer/model-configs
• ❌ Missing README.md in kits/sql-query-explainer/model-configs
• ❌ Missing flows/ directory in kits/sql-query-explainer/model-configs
• ❌ Missing config.json in kits/sql-query-explainer/lamatic.config.ts
• ❌ Missing README.md in kits/sql-query-explainer/lamatic.config.ts
• ❌ Missing flows/ directory in kits/sql-query-explainer/lamatic.config.ts
• ❌ Missing config.json in kits/sql-query-explainer/README.md
• ❌ Missing README.md in kits/sql-query-explainer/README.md
• ❌ Missing flows/ directory in kits/sql-query-explainer/README.md
• ❌ Missing config.json in kits/sql-query-explainer/.gitignore
• ❌ Missing README.md in kits/sql-query-explainer/.gitignore
• ❌ Missing flows/ directory in kits/sql-query-explainer/.gitignore
• ❌ Missing config.json in kits/sql-query-explainer/flows
• ❌ Missing README.md in kits/sql-query-explainer/flows
• ❌ Missing flows/ directory in kits/sql-query-explainer/flows
• ❌ Missing config.json in kits/sql-query-explainer/agent.md
• ❌ Missing README.md in kits/sql-query-explainer/agent.md
• ❌ Missing flows/ directory in kits/sql-query-explainer/agent.md

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🛑 Please fix the errors above before this PR can be merged.

Refer to CONTRIBUTING.md and CLAUDE.md for the expected folder structure.

[Saadonweb]

Submitting as part of the Lamatic mission-possible challenge.

This kit adds a SQL Query Explainer agent — accepts any SQL query, returns a structured JSON explanation with summary, clause-by-clause breakdown, performance concerns, and optimisation suggestions.

Please apply the mission-possible label.