Rename CLI command to OpenSkald

[skyloevil]

Summary

• rename the CLI entry point from openviking-agent to OpenSkald
• update README, architecture docs, and helper scripts to call uv run OpenSkald
• keep OpenViking project, knowledge base, config, classes, and module names unchanged

Verification

• uv run pytest
• uv run ruff check .
• scripts/check.sh

[gemini-code-assist]

Code Review

This pull request performs a comprehensive renaming of the project from 'OpenViking' to 'OpenSkald' across all documentation, configuration files, environment variables, CLI commands, Docker setups, and source code. The review feedback highlights two important issues in backend/app/config/settings.py: a path validation vulnerability where empty or relative dot paths can bypass existence checks and glob the entire project directory, and a configuration loading issue where explicitly specified configuration paths that do not exist are silently ignored instead of raising an error.

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