docs: add CLAUDE.md explaining docs folder structure

Clarifies that docs/ is a Mintlify documentation site for official
user-facing documentation (.mdx files), while context/ should contain
planning documents, design docs, and internal references.

Lists files currently in docs/ that should be moved to context/:
- typescript-errors.md
- worker-service-*.md files
- processing-indicator-*.md files
- CHROMA.md and chroma-search-completion-plan.md

Co-authored-by: Alex Newman <thedotmack@users.noreply.github.com>

docs/CLAUDE.md

@@ -0,0 +1,73 @@
+# Claude-Mem Documentation Folder
+
+## What This Folder Is
+
+This `docs/` folder is a **Mintlify documentation site** - the official user-facing documentation for claude-mem. It's a structured documentation platform with a specific file format and organization.
+
+## File Structure Requirements
+
+### Mintlify Documentation Files (.mdx)
+All official documentation files must be:
+- Written in `.mdx` format (Markdown with JSX support)
+- Listed in `docs.json` navigation structure
+- Follow Mintlify's schema and conventions
+
+The documentation is organized into these sections:
+- **Get Started**: Introduction, installation, usage guides
+- **Best Practices**: Context engineering, progressive disclosure
+- **Configuration & Development**: Settings, dev workflow, troubleshooting
+- **Architecture**: System design, components, technical details
+
+### Configuration File
+`docs.json` defines:
+- Site metadata (name, description, theme)
+- Navigation structure
+- Branding (logos, colors)
+- Footer links and social media
+
+## What Does NOT Belong Here
+
+**Planning documents, design docs, and reference materials should go in `/context/` instead:**
+
+Files that should be in `/context/` (not `/docs/`):
+- Planning documents (`*-plan.md`, `*-outline.md`)
+- Implementation analysis (`*-audit.md`, `*-code-reference.md`)
+- Error tracking (`typescript-errors.md`)
+- Design documents not part of official docs
+- PR review responses
+- Reference materials (like `agent-sdk-ref.md`)
+
+**Example**: The deleted `VIEWER.md` was moved because it was implementation documentation, not user-facing docs.
+
+## Current Files That Should Be Moved
+
+These `.md` files currently in `docs/` should probably be moved to `context/`:
+- `typescript-errors.md` - Error tracking
+- `worker-service-architecture.md` - Implementation details (not user-facing architecture)
+- `processing-indicator-audit.md` - Implementation audit
+- `processing-indicator-code-reference.md` - Code reference
+- `worker-service-rewrite-outline.md` - Planning document
+- `worker-service-overhead.md` - Analysis document
+- `CHROMA.md` - Implementation reference (if not user-facing)
+- `chroma-search-completion-plan.md` - Planning document
+
+## How to Add Official Documentation
+
+1. Create a new `.mdx` file in the appropriate subdirectory
+2. Add the file path to `docs.json` navigation
+3. Use Mintlify's frontmatter and components
+4. Follow the existing documentation style
+
+## Development Workflow
+
+**For contributors working on claude-mem:**
+- Read `/CLAUDE.md` in the project root for development instructions
+- Place planning/design docs in `/context/`
+- Only add user-facing documentation to `/docs/`
+- Test documentation locally with Mintlify CLI if available
+
+## Summary
+
+**Simple Rule**:
+- `/docs/` = Official user documentation (Mintlify .mdx files)
+- `/context/` = Development context, plans, references, internal docs