feat(spec): declare MetadataProtocol.historyMetaItem and de-cast the REST history door #27646

Job	Run time
filter	13s
Dogfood Verify CLI	7m 38s
Dogfood Regression Gate (2/3)	5m 58s
Build Core	7m 24s
Temporal Conformance (live PG + MySQL)	5m 19s
Build Docs	4m 51s
Test Core (2/6)	11m 22s
Test Core (5/6)	10m 52s
Test Core (4/6)	12m 27s
Dogfood Regression Gate (1/3)	8m 56s
Test Core (1/6)	12m 41s
Dogfood Regression Gate (3/3)	9m 14s
Test Core (6/6)	12m 41s
Test Core (3/6)	9m 31s
Console Pin Gate	0s
Dogfood Regression Gate	12s
Test Core	12s
	1h 59m 31s

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