Bump version to 0.1.3 and update release files

[gvreddy04]

This pull request updates the project version from 0.1.2 to 0.1.3 across all packaging, configuration, and documentation files, and improves the test coverage for SVG diagram templates. The most significant changes are grouped below:

Version Bump and Packaging Updates:

• Updated the project version to 0.1.3 in all relevant files including pyproject.toml, __init__.py, Homebrew formulae, GitHub Actions workflows, and documentation references. This ensures consistency across all distribution channels.
• Added new WinGet manifest files for version 0.1.3, including installer, locale, and version YAML files, to support the new release.

Build and Packaging Improvements:

• Expanded the list of files and directories included in the Python package build artifact to add .github/prompts, .github/agents, and .github/skills, ensuring all necessary assets are packaged.

Testing Improvements:

• Enhanced the SVG diagram template test to automatically discover all SVG templates, check that the templates list is not empty, and strengthen forbidden content checks (e.g., <image>, @import, external href). Also verifies that SVG files are ASCII-only.