docs(historian): fix-wave docs and stale comments

- Historian.md: Empty samples always Bad (writer/updater/read clamp),
  long-name refusal, 5 s bootstrap failure cache, AtTime after now, info-bit
  masking, HistoryUpdate does NOT type-check (M-1 decision), DeleteRaw
  needs both bounds, reverse Raw paging, the historian/historization metric
  prefixes, and provisioning numeric-only lines qualified as Gateway.
- CLAUDE.md numeric-only lines qualified as Gateway backend.
- Stale 'sole historian' lines in DriverLifecycle, ServiceHosting and the
  retired Wonderware stub; Client.CLI exit-code contract.
- ServerHistorianOptions: Endpoint/Backend XML docs untangled, Validate()
  indented; Program.cs comments are backend-neutral; T10 week-test day count.

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Historian.SqlServer.IntegrationTests/ProcessedReadTests.cs

@@ -187,7 +187,7 @@ public sealed class ProcessedReadTests(SqlHistorianFixture fx)
     public async Task A_weekly_interval_over_four_centuries_lands_samples_in_the_right_week()
     {
         // Hand-computed (calendar arithmetic, independent of SQL): 1601-01-01 → 2027-01-01 is 155 593 days =
-        // 22 227.57 weeks ⇒ 22 228 intervals (under the 100k cap). 2026-10-09 08:00 is 155 498 days in ⇒ week
+        // 22 227.57 weeks ⇒ 22 228 intervals (under the 100k cap). 2026-10-09 08:00 is 155 509 days in ⇒ week
         // index 22 215, which starts Monday 2026-10-05 00:00; every fixture sample (t0 … t0+40 s) is in it.
         var db = await ReadTestDb.CreateAsync(fx);
         await db.SeedAAsync();