docs: publish Preview 19 dogfood evidence

Export the reviewed allowlisted snapshot from private source commit 05928cebd01b586cf9e9d4b8c8537a7605a6068c. This records the exact candidate, bounded capacity result, stateful migration scratch requirement, authenticated batch identity proof, and immediate live acceptance evidence.

AI-Assisted: OpenAI Codex
Signed-off-by: Cole Speelman <crspeelman@gmail.com>

go.mod

@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+
+module gamertan.com/observatory
+
+go 1.26
+
+require (
+	gamertan.com/sandwich-hime/sando v1.0.0-beta.1
+	gamertan.com/web v0.1.0-preview.4
+	github.com/klauspost/compress v1.18.7
+	go.opentelemetry.io/proto/otlp v1.11.0
+	google.golang.org/protobuf v1.36.11
+	modernc.org/sqlite v1.56.0
+)
+
+require (
+	gamertan.com/tend v0.2.0-preview.2 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/mattn/go-isatty v0.0.24 // indirect
+	github.com/ncruces/go-strftime v1.0.0 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	golang.org/x/crypto v0.54.0 // indirect
+	golang.org/x/sync v0.22.0 // indirect
+	golang.org/x/sys v0.47.0 // indirect
+	modernc.org/libc v1.74.4 // indirect
+	modernc.org/mathutil v1.7.1 // indirect
+	modernc.org/memory v1.11.0 // indirect
+)
+
+tool gamertan.com/tend/cmd/tend