refactor: remove type: ignore by fixing build_embedder typing

[supraja777]

Note

Low Risk
Low risk: mostly developer-tooling cleanup and small validation/typing adjustments; only minor behavioral change is more permissive handling of non-JSON config strings.

Overview
Simplifies local pre-commit hooks by removing the venv bash -c 'source ...' wrappers and running ruff, ruff format, and mypy directly via uv run.

In Crew, updates config validation to attempt json.loads for string inputs but fall back to returning the original string when it isn’t valid JSON (instead of assuming Json), and adjusts typing around embedder initialization by casting self.embedder when calling build_embedder plus a small signature formatting cleanup for _add_memory_tools.

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