Remove custom key decoders #69

Job	Run time
Construct linkage matrix	5s
Construct example packages matrix	4s
Unit tests / Construct unit test matrix	5s
Static SDK / Construct Static SDK matrix	5s
macOS tests / Construct Darwin matrix	4s
Release builds / Construct release build matrix	5s
Soundness / License headers check	5s
Soundness / Format check	53s
Soundness / API breakage check	1m 56s
Soundness / Unacceptable language check	7s
Soundness / Documentation check	1m 42s
Soundness / Broken symlinks check	8s
Soundness / Shell check	48s
Soundness / YAML lint check	8s
Soundness / Python lint check	10s
Example packages / Linux (6.2)	1m 0s
macOS tests / Xcode 26.0	3m 40s
macOS tests / Xcode 26.1	3m 25s
macOS tests / Xcode latest beta	3m 23s
Release builds / Release builds / Linux (nightly-main)	1m 53s
Release builds / Release builds / Linux (6.2)	1m 43s
Static SDK / Static SDK / Linux (latest-release Jammy)	1m 48s
Static SDK / Static SDK / Linux (main Jammy)	2m 40s
Unit tests / Unit tests / Linux (nightly-main)	1m 56s
Unit tests / Unit tests / Linux (6.2)	1m 46s
Linkage test / Linux (6.2)	1m 13s
	30m 52s

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