fix(FirmwarePlugin): keep enum sentinel values outside param operating range (Stable_V5.1)

[DonLakeFlyer]

Stable backport of #14868 (fix for #14854).

Clean cherry-pick of 188a5cb. Verified locally on Stable_V5.1: build succeeds and APMParameterMetaDataTest passes.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (Stable_V5.1@ecb0691). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/FirmwarePlugin/ParameterMetaData.cc	0.00%	0 Missing and 2 partials ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (30.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@              Coverage Diff               @@
##             Stable_V5.1   #14871   +/-   ##
==============================================
  Coverage               ?   32.78%           
==============================================
  Files                  ?      784           
  Lines                  ?    67690           
  Branches               ?    31363           
==============================================
  Hits                   ?    22195           
  Misses                 ?    30582           
  Partials               ?    14913           

Flag	Coverage Δ
unittests	32.78% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/FirmwarePlugin/ParameterMetaData.cc	48.36% <0.00%> (ø)

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[github-actions]

Build Results

Platform Status

Platform	Status	Details
Linux	Passed	View
Windows	Passed	View
MacOS	Passed	View
Android	Passed	View

All builds passed.

Pre-commit

Check	Status	Details
pre-commit	Failed (non-blocking)	View

Pre-commit hooks: 2 passed, 75 failed, 7 skipped.

Test Results

linux-coverage-integration: 37 passed, 0 skipped
linux-coverage-unit: 121 passed, 0 skipped
linux-sanitizers-integration: 20 passed, 0 skipped
linux-sanitizers-unit: 121 passed, 0 skipped
Total: 299 passed, 0 skipped

Code Coverage

Coverage: 69.5%

No baseline available for comparison

Artifact Sizes

Artifact	Size
QGroundControl	252.26 MB
QGroundControl-aarch64	176.30 MB
QGroundControl-installer-AMD64	137.81 MB
QGroundControl-installer-AMD64-ARM64	80.35 MB
QGroundControl-installer-ARM64	109.10 MB
QGroundControl-linux	84.32 MB
QGroundControl-mac	84.31 MB
QGroundControl-x86_64	188.51 MB
No baseline available for comparison

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_{Updated: 2026-08-15 19:02:22 UTC • Commit: 3448238 • Triggered by: Linux}