feat(page): add typed keyset pagination for Bob (#15)

Add transport-neutral keyset pagination through native Bob query mods.
Preserve supported cursor value types in a compact versioned format, with
bidirectional pages, explicit row keys, and a separate opt-in count.
Include SQLite tests, PostgreSQL service CI, and the cursor-format ADR.

Closes #6

go.mod

@@ -3,6 +3,15 @@ module go.auvem.com/corestack
 go 1.27.1
 
 require (
+	github.com/lib/pq v1.10.9
+	github.com/mattn/go-sqlite3 v1.14.32
+	github.com/stephenafamo/bob v0.50.0
+	github.com/stephenafamo/scan v0.9.0
 	github.com/yuin/goldmark v1.8.6
 	go.yaml.in/yaml/v3 v3.0.5
 )
+
+require (
+	github.com/aarondl/opt v0.0.0-20250607033636-982744e1bd65 // indirect
+	github.com/qdm12/reprint v0.0.0-20200326205758-722754a53494 // indirect
+)