Re-vendor the shared files from sneak/prompts at dd4027b (closes #52)

Takes .golangci.yml, .dockerignore, .gitignore, .editorconfig, the
workflow and REPO_POLICIES.md from sneak/prompts dd4027b, keeping this
repository's own entries after the shared content. Lint (golangci-lint
v2.14.0) and test become Dockerfile phases that script/lint and
script/test build alone and uncached; the image build depends on both,
and script/cibuild bootstraps, runs script/check, then builds the image.
The agent guidance file moves to AGENTS.md. The Go code is fixed for
what the new configuration finds; reads that iterate rows now also
report an iteration error.

Model: opus-5-5

internal/database/interface.go

@@ -29,6 +29,8 @@ type Stats struct {
 // Store defines the interface for database operations. It provides methods for
 // managing ASNs, prefixes, announcements, peerings, BGP peers, and live routes.
 // Implementations must be safe for concurrent use.
+//
+//nolint:interfacebloat // the one seam handlers and tests depend on
 type Store interface {
 	// ASN operations
 	GetOrCreateASN(number int, timestamp time.Time) (*ASN, error)
@@ -57,8 +59,10 @@ type Store interface {
 	UpsertLiveRouteBatch(routes []*LiveRoute) error
 	DeleteLiveRoute(prefix string, originASN int, peerIP string) error
 	DeleteLiveRouteBatch(deletions []LiveRouteDeletion) error
-	GetPrefixDistribution() (ipv4 []PrefixDistribution, ipv6 []PrefixDistribution, err error)
-	GetPrefixDistributionContext(ctx context.Context) (ipv4 []PrefixDistribution, ipv6 []PrefixDistribution, err error)
+	GetPrefixDistribution() (
+		ipv4 []PrefixDistribution, ipv6 []PrefixDistribution, err error)
+	GetPrefixDistributionContext(ctx context.Context) (
+		ipv4 []PrefixDistribution, ipv6 []PrefixDistribution, err error)
 	GetLiveRouteCounts() (ipv4Count, ipv6Count int, err error)
 	GetLiveRouteCountsContext(ctx context.Context) (ipv4Count, ipv6Count int, err error)
 
@@ -77,9 +81,13 @@ type Store interface {
 	GetASPeers(asn int) ([]ASPeer, error)
 	GetASPeersContext(ctx context.Context, asn int) ([]ASPeer, error)
 	GetPrefixDetails(prefix string) ([]LiveRoute, map[int]ASN, error)
-	GetPrefixDetailsContext(ctx context.Context, prefix string) ([]LiveRoute, map[int]ASN, error)
+	GetPrefixDetailsContext(
+		ctx context.Context, prefix string,
+	) ([]LiveRoute, map[int]ASN, error)
 	GetRandomPrefixesByLength(maskLength, ipVersion, limit int) ([]LiveRoute, error)
-	GetRandomPrefixesByLengthContext(ctx context.Context, maskLength, ipVersion, limit int) ([]LiveRoute, error)
+	GetRandomPrefixesByLengthContext(
+		ctx context.Context, maskLength, ipVersion, limit int,
+	) ([]LiveRoute, error)
 
 	// Lifecycle
 	Close() error