Enforce EM102 by fixing exception formatting and removing ignore

[Copilot]

This PR addresses EM102 by eliminating an exception f-string in production code and removing EM102 from Ruff’s global ignore list so the rule is enforced going forward.

• Scope of change

  • TaskflowHeader version validation (src/seclab_taskflow_agent/models.py)
    • Replaced inline f-string construction in raise ValueError(...) with a pre-assigned message variable to comply with EM102.
  • Ruff configuration (pyproject.toml)
    • Removed EM102 from [tool.ruff.lint].ignore baseline suppressions.

• Code example

  if v != SUPPORTED_VERSION:
      msg = f"Unsupported version: {v}. Only version {SUPPORTED_VERSION} is supported."
      raise ValueError(msg)

[Copilot]

Pull request overview

This PR aims to start enforcing Ruff rule EM102 (no f-strings directly inside exception constructors) by updating one offending ValueError(...) site and removing EM102 from Ruff’s global ignore list so future code must comply.

Changes:

• Refactors TaskflowHeader._validate_version() to avoid raising an exception with an inline f-string.
• Updates pyproject.toml to remove EM102 from [tool.ruff.lint].ignore.

Show a summary per file

File	Description
src/seclab_taskflow_agent/models.py	Refactors exception message construction to comply with EM102.
pyproject.toml	Removes EM102 from the global Ruff ignore list to enforce the rule.

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• Files reviewed: 2/2 changed files
• Comments generated: 1