Add AGENTS.md and CLAUDE.md

[austin-denoble]

Problem

Missing agentic context in this repo.

Solution

Add AGENTS.md and CLAUDE.md, fill in basic repo information in AGENTS.md, redirect to AGENTS.md in CLAUDE.md.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

Test Plan

N/A

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Note

Low Risk
Low risk documentation-only change with no runtime or build impact.

Overview
Adds AGENTS.md, a contributor guide for AI agents describing the Pinecone CLI’s entry points, command structure, key directories, and build/testing conventions.

Adds CLAUDE.md as a lightweight pointer that redirects Claude/agent tooling to AGENTS.md.

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