fix(core_affinity2): use real core IDs for --cores all

[devAL3X]

Description

Fix --cores all to use the actual CPU IDs returned by the system affinity mask instead of assuming that CPU IDs are consecutive starting from zero.
This is important when the process is restricted to a non-contiguous set of CPUs, for example 1,3,7. The same issue can occur when CPU resources are limited through Linux cgroups or container CPU constraints.

Checklist

• I have run ./scripts/precommit.sh and addressed all comments

[Copilot]

Copilot review overview

🟢 Approval recommended

The implementation addresses non-contiguous CPU IDs; the remaining regression-test request is a minor nit.

Review effort: Lite
Findings: None

What changed in this PR

Fixes --cores all to use actual CPU IDs from the process affinity mask, including non-contiguous allocations.

Changes:

• Uses get_core_ids() instead of sequential IDs.
• Supports cgroup and container CPU constraints.

File	Summary
crates/​core_affinity2/​src/​lib.rs	Uses affinity-derived CPU IDs for all.

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