Packaged AppImage runtime transcript
AI-assisted; verified with the tests and tools listed above.
All measurements come from the real packaged app runs; local paths are redacted.

Before, 8 MiB free
==================
REAL PACKAGED APPIMAGE / base-low-final
Linux x64; Xvfb; fresh isolated app state
Installed name: t3code.AppImage
Initial size: 214484499 bytes
Cache/destination devices differ: true

1. Select Stable; check newer local release.
Available: 0.1.10; state: available

2. Download update completely.
Downloaded: 0.1.10; state: downloaded
Complete cached payload: true
Payload size: 214467628 bytes

3. Destination free: 8388608 bytes

4. Invoke production Install / Restart IPC.
Updater reported ENOSPC: false
Installed file size: 8388608 bytes
Original SHA-512 preserved: false
New payload SHA-512 installed: false
Complete cache preserved: true
App state: downloaded; context: null

5. Close running app; reopen installed filename.
Reopened original successfully: false
Launch exit: 127; file is unusable

Measured result:
{
  "originalSize": 214484499,
  "payloadSize": 214467628,
  "installedSize": 8388608,
  "originalPreserved": false,
  "payloadInstalled": false,
  "cachePreserved": true,
  "reopened": false
}
Actual runtime error excerpt:
mv: error writing '<redacted file path>': No space left on device
Something went wrong trying to read the squashfs image.
Cannot mount AppImage, please check your FUSE setup.

After, 8 MiB free
=================
REAL PACKAGED APPIMAGE / head-low-final
Linux x64; Xvfb; fresh isolated app state
Installed name: t3code.AppImage
Initial size: 214468475 bytes
Cache/destination devices differ: true

1. Select Stable; check newer local release.
Available: 0.1.10; state: available

2. Download update completely.
Downloaded: 0.1.10; state: downloaded
Complete cached payload: true
Payload size: 214467628 bytes

3. Destination free: 8388608 bytes

4. Invoke production Install / Restart IPC.
Updater reported ENOSPC: true
Installed file size: 214468475 bytes
Original SHA-512 preserved: true
New payload SHA-512 installed: false
Complete cache preserved: true
App state: downloaded; context: null

5. Close running app; reopen installed filename.
Reopened original successfully: true
Reopened version: 0.1.9

Measured result:
{
  "originalSize": 214468475,
  "payloadSize": 214467628,
  "installedSize": 214468475,
  "originalPreserved": true,
  "payloadInstalled": false,
  "cachePreserved": true,
  "reopened": true
}
Actual runtime error excerpt:
  cause: Error [ENOSPC]: ENOSPC: no space left on device, copyfile '<redacted file path>' -> '<redacted file path>'

Before, 600 MiB free
====================
REAL PACKAGED APPIMAGE / base-space
Linux x64; Xvfb; fresh isolated app state
Installed name: t3code.AppImage
Initial size: 214484499 bytes
Cache/destination devices differ: true

1. Select Stable; check newer local release.
Available: 0.1.10; state: available

2. Download update completely.
Downloaded: 0.1.10; state: downloaded
Complete cached payload: true
Payload size: 214467628 bytes

3. Destination free: 629145600 bytes

4. Invoke production Install / Restart IPC.
Updater reported ENOSPC: false
Installed file size: 214467628 bytes
Original SHA-512 preserved: false
New payload SHA-512 installed: true
Complete cache preserved: false

5. Observe automatic relaunch (no manual launch).
Original process exited: true
Desktop window automatically relaunched: true

Measured result:
{
  "originalSize": 214484499,
  "payloadSize": 214467628,
  "installedSize": 214467628,
  "originalPreserved": false,
  "payloadInstalled": true,
  "cachePreserved": false,
  "originalProcessExited": true,
  "autoRelaunched": true
}
Actual runtime error excerpt:
(No install error.)

After, 600 MiB free
===================
REAL PACKAGED APPIMAGE / head-space
Linux x64; Xvfb; fresh isolated app state
Installed name: t3code.AppImage
Initial size: 214468475 bytes
Cache/destination devices differ: true

1. Select Stable; check newer local release.
Available: 0.1.10; state: available

2. Download update completely.
Downloaded: 0.1.10; state: downloaded
Complete cached payload: true
Payload size: 214467628 bytes

3. Destination free: 629145600 bytes

4. Invoke production Install / Restart IPC.
Updater reported ENOSPC: false
Installed file size: 214467628 bytes
Original SHA-512 preserved: false
New payload SHA-512 installed: true
Complete cache preserved: false

5. Observe automatic relaunch (no manual launch).
Original process exited: true
Desktop window automatically relaunched: true

Measured result:
{
  "originalSize": 214468475,
  "payloadSize": 214467628,
  "installedSize": 214467628,
  "originalPreserved": false,
  "payloadInstalled": true,
  "cachePreserved": false,
  "originalProcessExited": true,
  "autoRelaunched": true
}