[v1.0] Publish a dependency and platform compatibility dashboard

[codeforester]

Goal

Make support status visible to adopters before they integrate the framework.

Scope

• Publish tested Python, Click, Typer, optional dependency, operating-system, and shell-environment combinations.
• Show current, minimum, and end-of-support versions.
• Generate the dashboard from CI evidence rather than maintaining a second manual matrix.
• Link failures to the responsible workflow and document support-policy changes.

Acceptance criteria

• The published dashboard reflects the latest completed CI runs.
• Unsupported combinations are clearly distinguished from untested combinations.
• Release notes link to compatibility changes.
• The dashboard is accessible from PyPI and the README.

Project fields

• Status: Backlog
• Priority: P2
• Area: CI
• Initiative: Adoption Polish
• Size: M