Fix F401 (unused imports) and remove from suppressions

[Copilot]

Part of removing all ruff suppressions from pyproject.toml. This PR addresses F401 (unused imports) - one of 55 suppressed warning types, each being fixed in separate PRs.

Changes

• Removed unused imports from jsonrpyc/__init__.py: io, Optional, Type
• Removed F401 from pyproject.toml ignore list

All other imports in the file remain (json, os, re, sys, threading, time, Callable, Any, Protocol, TypeAlias).

Original prompt

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This section details on the original issue you should resolve

<issue_title>fix all linter errors</issue_title>
<issue_description>Remove all of the ruff suppressions currently listed in pyproject.toml and fix the errors in the code.</issue_description>

<agent_instructions>Create a separate sub-issue for each linter warning that has been suppressed and a separate pull request for each of those sub-issues.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes fix all linter errors #143

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[Copilot]

Pull request overview

This PR removes unused imports and eliminates the F401 (unused imports) suppression from the project's linting configuration as part of a broader effort to address all suppressed linter warnings.

Changes:

• Removed three unused imports (io, Optional, Type) from jsonrpyc/__init__.py
• Removed F401 from the ruff linter ignore list in pyproject.toml

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/seclab_taskflow_agent/mcp_servers/codeql/jsonrpyc/init.py	Removed unused imports: io, Optional (replaced by PEP 604 union syntax), and Type (not used anywhere)
pyproject.toml	Removed F401 (unused import) from the ruff linter suppression list

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