chore: add CLAUDE.md and project memory for Claude Code

Add CLAUDE.md with project guidance for adding new LLM providers.
Add .claude/memory/ with feedback rules:
- Preserve markdown quotes when editing
- Save memories in project directory

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/memory/MEMORY.md

@@ -0,0 +1,4 @@
+# Memory Index
+
+- [Preserve markdown quotes](feedback_markdown_quotes.md) — Don't edit blockquote content unless explicitly requested or fetching fresh info from source
+- [Project-local memory](feedback_memory_location.md) — Always save memories to `.claude/memory/` in project, not user global location

.claude/memory/feedback_markdown_quotes.md

@@ -0,0 +1,13 @@
+---
+name: Preserve markdown quotes
+description: Do not edit quoted content in markdown unless explicitly requested
+type: feedback
+---
+
+When editing markdown files, never modify content in blockquotes (lines starting with `>`) unless:
+1. The user explicitly requests changes to that content in the prompt, OR
+2. The content is being updated from a website the user wants crawled for fresh information
+
+**Why:** Quoted content often represents exact citations or official documentation that should remain verbatim.
+
+**How to apply:** When tuning/editing markdown, skip over any blockquote sections and leave them unchanged. Only modify quotes if the user specifically asks or when fetching updated info from a source URL.

.claude/memory/feedback_memory_location.md

@@ -0,0 +1,11 @@
+---
+name: Project-local memory
+description: Always save memories inside the project, not user global location
+type: feedback
+---
+
+Always save memory files to the project's `.claude/memory/` directory, not to the user's global memory location (`~/.claude/projects/`).
+
+**Why:** Keeps project-specific knowledge alongside the codebase for portability and version control.
+
+**How to apply:** When creating or updating memories, always write to `.claude/memory/` within the project root.

.claude/settings.json

@@ -0,0 +1,7 @@
+{
+  "permissions": {
+    "allow": [
+      "Write(*.md)"
+    ]
+  }
+}

CLAUDE.md

@@ -0,0 +1,22 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This is a curated list of budget-friendly LLM providers. It's a documentation-only project (no code) maintained in README.md.
+
+## Adding New Providers
+
+When adding a new provider to README.md, include:
+- Provider name with link to homepage
+- Pricing/plan details (if applicable)
+- Free tier limits or usage restrictions
+- Source link for verification
+- Footnote with the date information was verified (format: `[^providername]: Check at MMM DD YYYY`)
+
+## Structure
+
+README.md is organized into sections:
+- **Providers support coding plans**: Subscription-based coding plans
+- **Free providers**: Providers with free tiers or trials