fix(github-cli-multi): skip live SSH verification under --check

[tahirqureshi]

Problem

Running the play with --check failed at Assert SSH access and identity match for all accounts with a misleading "passphrase-related" diagnosis for every account:

SSH verification FAILED for alias balli (expected user tahir-ec-ballicom).
GitHub responded: (no Hi response)
... most likely passphrase-related.

This was a check-mode false failure, not a real passphrase issue. The failed items show the smoking gun:

"skipped": true,  "rc": 0,  "stdout": "",
"msg": "Command would have run if not in check mode"

Root cause

The Verify SSH access task is a read-only SSH probe (changed_when: false), but it depends on side-effecting tasks that Ansible skips in check mode:

• the passphrase file /tmp/.github_ssh_pp (created by a copy task)
• key generation

In check mode the probe is skipped, so item.stdout is empty, and the downstream assert ('successfully authenticated' in item.stdout) fails — printing the misleading passphrase remediation.

Fix

• Guard the verify / display / assert tasks with when: not ansible_check_mode — a dry run cannot perform live SSH auth anyway, so it now skips cleanly instead of failing spuriously.
• Harden the loops with | default([]) so they no-op when the probe is skipped.

Verification

• ./scripts/qa-all.bash → passes
• ansible-playbook ... --syntax-check → exit 0
• YAML parse → OK

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