[SCO-0002] Remove custom key decoders #70

Job	Run time
Construct example packages matrix	3s
Construct linkage matrix	3s
Static SDK / Construct Static SDK matrix	4s
Unit tests / Construct unit test matrix	6s
macOS tests / Construct Darwin matrix	4s
Release builds / Construct release build matrix	4s
Soundness / Documentation check	1m 48s
Soundness / Unacceptable language check	7s
Soundness / YAML lint check	8s
Soundness / License headers check	6s
Soundness / Broken symlinks check	6s
Soundness / Python lint check	7s
Soundness / Format check	57s
Soundness / Shell check	53s
Soundness / API breakage check	1m 33s
Linkage test / Linux (6.2)	1m 1s
Example packages / Linux (6.2)	1m 6s
Release builds / Release builds / Linux (6.2)	1m 43s
Release builds / Release builds / Linux (nightly-main)	1m 56s
macOS tests / Xcode 26.1	4m 23s
macOS tests / Xcode 26.0	4m 23s
macOS tests / Xcode latest beta	4m 25s
Static SDK / Static SDK / Linux (main Jammy)	25m 7s
Static SDK / Static SDK / Linux (latest-release Jammy)	1m 48s
Unit tests / Unit tests / Linux (6.2)	2m 24s
Unit tests / Unit tests / Linux (nightly-main)	2m 39s
	57m 4s

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