docs: add mypy permissions setup

CLAUDE.md

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+# Claude Development Instructions
+
+## Type Checking with mypy
+
+### Setup
+This project uses mypy for static type checking. The mypy dependency is included in `requirements-dev.txt`.
+
+### Required Commands
+To enable full type checking capabilities, Claude needs permission to run:
+- `mypy servc --check-untyped-defs` - Run type checking on the servc package with untyped function checking
+- `pip install -r requirements-dev.txt` - Install development dependencies including mypy
+- `python -m pip install -r requirements-dev.txt` - Alternative pip installation method
+
+### mypy Configuration
+The project includes type stubs and typing information:
+- `servc/py.typed` - Marks the package as type-aware
+- Type stubs for dependencies are included in requirements-dev.txt
+
+### Development Workflow
+1. Install development dependencies: `pip install -r requirements-dev.txt`
+2. Run type checking: `mypy servc --check-untyped-defs`
+3. Fix any type issues before committing
+
+## Permissions
+Claude requires the following Bash tool permissions:
+- `pip` commands for dependency installation
+- `python` commands for running type checkers
+- `mypy` commands for static type analysis