feat: Add Python helper scripts

[KrystofS]

What does this PR do?

Converts the existing Bash integration scripts (scripts/*.sh) into cross-platform Python equivalents (scripts/*.py).

This provides support for Windows users, while preserving the original .sh files so existing UNIX workflows remain unbroken. The new Python scripts have zero third-party dependencies and support Python 3.7+ out of the box.

Key script additions:

• scripts/utils.py: Shared utilities (color output, frontmatter parsing, Windows ANSI support).
• scripts/convert.py: Converts agents to all 8 tool formats identically to the bash script.
• scripts/install.py: Replicates the interactive interactive TUI selector and auto-detection.
• scripts/lint-agents.py: Frontmatter validator (now used in .github/workflows/lint-agents.yml).

The README.md has also been updated to offer the python commands as explicit alternatives alongside the .sh guides.

Agent Information (if adding/modifying an agent)

• Agent Name: N/A
• Category: N/A
• Specialty: N/A

Checklist

• Follows the agent template structure from CONTRIBUTING.md
• Includes YAML frontmatter with name, description, color
• Has concrete code/template examples (for new agents)
• Tested in real scenarios
• Proofread and formatted correctly

[msitarzewski]

Hey @KrystofS — thanks for this, and for the thoughtful comments on #153.

We've got four PRs for Windows support now (#171, #172, #190, #191). I've left a comment on #153 asking everyone to converge on one approach. Your maintainability argument for Python is compelling — would love you to make the case there so the group can align.

[msitarzewski]

Heads up: we're consolidating the Windows support conversation into a single Discussion: #197 — please weigh in there so we can align on one approach.