APM - Version 2.0.5b [ Open-Beta ]

Changelogs

Prevented idle or slow IPC clients from stalling the APM and AMS daemon. (Performance Improvement)
Made it so that install/remove results match durable package state. (Bugfix + Stability Improvement)
Fixed Android.bp so that APM can be properly integrated into AOSP source code. (Bugfix)
Made it so that parsed repository indexes within APM's daemon (apmd) are cached. (Performance Improvement)
Reduced whole-tree permission normalization work for Termux package installations. (Performance Improvement)

Complete and exit the setup screen of LineageOS if you haven't already. Skip this step if you have already setup LineageOS.
Plug in your phone to your computer and reboot into recovery mode. This can be done via various methods, so find how to enter recovery mode on your phone.
Go into "Advanced"/"Advanced Options" and press "Mount/unmount system", then press "Enable ADB".
Go back and go to "Apply update" and then press "Apply from ADB".
Go to your Terminal or Command Prompt, and start ADB via adb start-server if you haven't already done so. After that, run adb devices and check if your device is detected like this for example: 3B171FDJG003NC sideload.
Run adb -d sideload <apm-zip-file.zip>. An example would be: adb -d sideload apm-lineage-recovery-20260530-arm64-v8a.zip. LineageOS Recovery may say that the signature of the ZIP file is invalid or something -- Continue on with installation, as that is expected.
Once installation finishes, reboot your phone back to the system. The system should boot as normal.
You're finished. That's it.

All of APM and AMS are now essentially complete in terms of functionality and stability. Expect less updates due to this.
Pretty much all packages should be installable without issues now.
All of APM now works far faster than the previous versions.
I am now working and experimenting on making X11/XOrg stuff work via APM. Progress is doing pretty well so far.
Some bugs may still exist, so please remember to report any bugs to me!
Fun Fact: Both APM and AMS survive OTA updates via addon.d!