Add pyright strict mode on the whole project

[Kludex]

Took me my morning, but I got it.

This PR doesn't have any change on the package itself (src/mcp).

Note

See #1254 (comment), as
I had to bump pydantic to 2.11, and that may not be wanted? The package is broken for FastMCP with proper
generic usage on early versions of pydantic tho.

[Copilot]

Pull Request Overview

This PR enables pyright strict mode across the entire project by adding comprehensive type annotations and fixing type-related issues. The changes improve type safety and developer experience while maintaining backward compatibility.

• Enhanced type safety with strict pyright configuration and proper type annotations
• Fixed import formatting by consolidating multi-line imports into single lines
• Added comprehensive type hints for function parameters, return values, and variables across test files, examples, and server implementations

Reviewed Changes

Copilot reviewed 74 out of 74 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
pyproject.toml	Enabled strict type checking with execution environments for different project areas
tests/	Added type annotations for variables, function parameters, and return types
examples/	Updated server and client examples with proper type hints and Context typing
scripts/	Fixed type annotations for regex match objects
src/mcp/shared/memory.py	Consolidated imports and maintained existing functionality

[Kludex]

Those changes were made to match the main line-length. I did it in this PR because when I changed one of the files in the examples, it trigger the formatting.

[Kludex]

It seems we do need to bump pydantic to 2.11.0, otherwise weird errors happen. There was a discussion about it here: #1041 (even if the PR didn't really bump pydantic in the package itself).