Repair T1 Mac PCIe hotplug defaults

[Drecullith]

Summary

Repair existing T1 Mac installations whose Limine configuration still contains pcie_ports=compat.

The earlier T2 migration replaces this parameter with:

pm_async=off mem_sleep_default=deep

but it is gated specifically on T2 hardware and operates on t2-mac.conf. Existing T1 MacBook installations can instead retain /etc/limine-entry-tool.d/macbook-t1.conf with the obsolete pcie_ports=compat setting.

On affected machines, that setting disables native PCIe hotplug and can prevent PCIe-tunneled devices behind a Thunderbolt dock from appearing even though the dock itself is authorized and DisplayPort passthrough works.

This adds a new migration rather than modifying the previous T2 migration, since systems that already completed that migration would not rerun it.

The new migration:

• acts only when macbook-t1.conf exists;
• replaces only pcie_ports=compat;
• preserves all unrelated kernel parameters;
• rebuilds the Limine boot image after changing the configuration;
• records successful repair with a machine-wide marker;
• retries the rebuild if configuration repair succeeded but the previous rebuild was interrupted;
• leaves systems without the T1 configuration untouched;
• leaves already-current systems untouched.

Fixes #10638.

Tests

Added test/shell.d/t1-pcie-hotplug-test.sh covering:

• stale T1 configuration is migrated;
• unrelated kernel parameters are preserved;
• pcie_ports=compat is removed;
• the Limine boot image is rebuilt;
• repeated execution before reboot is idempotent;
• an interrupted rebuild is retried without editing the configuration again;
• systems without macbook-t1.conf are skipped;
• already-current/running configurations are left unchanged.

Focused regression suite: 5/5 passing.

Also verified:

• bash -n migrations/1788906000.sh
• bash -n test/shell.d/t1-pcie-hotplug-test.sh

No physical T1 MacBook hardware was available for live verification. The issue reporter independently reports successful recovery after applying the equivalent kernel-command-line change and rebuilding Limine.