Add Copilot support

[NamigGadir]

We need Copilot CLI support for skillspector. In this pr we have implementations: #679

[rng1995]

The implementation originally linked here, PR #679, is closed without merging. The existing Copilot CLI provider proposal remains open in PR #572, tracked under #8. Keeping this request open while that implementation is pending; no Copilot provider delivery is implied by closing #679.

PR-state snapshot checked on 2026-10-04:

• PR #572 — open, non-draft; GitHub review decision: changes requested; latest reported check rollup: success.

The older proposal #679 closed without merging. PR #572 is the shared implementation tracked under issue #8; neither issue is resolved until accepted Copilot support lands.

Keeping this issue open: the relevant implementation is not merged and the remaining scope still needs verification. Check/review status is a point-in-time snapshot, not a claim of merge readiness.