Graduate server 8.8

[mgravell]

• v8.8 APIs are no longer considered [Experimental]
• moves "unshipped.txt" entries to "shipped.txt", 'cos they are

---

Note

Medium Risk
Promotes a large set of time-series and search APIs to stable contracts and removes experimental compiler warnings; behavior is unchanged but consumers lose NRS002 guardrails and must target Redis 8.8+ for multi-aggregate usage.

Overview
Graduates Redis 8.8 time-series APIs so they are stable public surface: [Experimental] / diagnostic NRS002 is removed from TsAggregations, multi-value TimeSeriesTuple.Create / indexer, and the related range command overloads that take TsAggregations.

Those members move from PublicAPI.Unshipped.txt into PublicAPI.Shipped.txt (no more [NRS002] annotations). Build NoWarn no longer suppresses NRS002. Experiments drops the Server_8_8 constant, records NRS002 as a retired id (with NRS001), and updates UrlFormat to .../exp/{0} for future experimental features.

Several search APIs that were still unshipped (Warnings on result types, AggregationRequest.AddScores, VectorSearchMethod.NearestNeighbour) are also promoted to shipped in the same pass.

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