refactor: formalize C ABI codec registry via as_c_name/from_c_name #899

Job	Run time
Skit / Test (GPU)	1m 59s
UI / Lint (TypeScript + ESLint)	42s
Plugins / Lint (Sherpa-ONNX Plugins)	1m 12s
Plugins / Format Check	17s
UI / Knip (unused code)	18s
Skit / Test	4m 20s
Plugins / Lint (Simple Plugins)	4m 16s
UI / Build	11s
UI / Test	31s
E2E / Playwright E2E	4m 19s
Plugins / Lint (Whisper)	43s
Skit / Lint (fmt + clippy)	3m 2s
Skit / Build	4m 23s
Plugins / Lint (NLLB)	2m 10s
All Checks Passed	1s
	28m 24s

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