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/models.go

@@ -1,4 +1,3 @@
-// Package database provides SQLite storage for BGP routing data.
 package database
 
 import (
@@ -9,6 +8,8 @@ import (
 
 // ASN represents an Autonomous System Number with its metadata including
 // handle, description, WHOIS data, and first/last seen timestamps.
+//
+//nolint:tagliatelle // field names are the existing JSON API
 type ASN struct {
 	ASN         int    `json:"asn"`
 	Handle      string `json:"handle"`
@@ -36,37 +37,39 @@ type ASN struct {
 // Prefix represents an IP prefix (CIDR block) with its IP version (4 or 6)
 // and first/last seen timestamps.
 type Prefix struct {
-	ID        uuid.UUID `json:"id"`
-	Prefix    string    `json:"prefix"`
-	IPVersion int       `json:"ip_version"` // 4 or 6
-	FirstSeen time.Time `json:"first_seen"`
-	LastSeen  time.Time `json:"last_seen"`
+	ID        uuid.UUID
+	Prefix    string
+	IPVersion int // 4 or 6
+	FirstSeen time.Time
+	LastSeen  time.Time
 }
 
 // Announcement represents a BGP announcement or withdrawal event,
 // containing the prefix, AS path, origin ASN, peer ASN, next hop, and timestamp.
 type Announcement struct {
-	ID           uuid.UUID `json:"id"`
-	PrefixID     uuid.UUID `json:"prefix_id"`
-	PeerASN      int       `json:"peer_asn"`
-	OriginASN    int       `json:"origin_asn"`
-	Path         string    `json:"path"` // JSON-encoded AS path
-	NextHop      string    `json:"next_hop"`
-	Timestamp    time.Time `json:"timestamp"`
-	IsWithdrawal bool      `json:"is_withdrawal"`
+	ID           uuid.UUID
+	PrefixID     uuid.UUID
+	PeerASN      int
+	OriginASN    int
+	Path         string // JSON-encoded AS path
+	NextHop      string
+	Timestamp    time.Time
+	IsWithdrawal bool
 }
 
 // ASNPeering represents a peering relationship between two ASNs,
 // stored with the lower ASN as ASA and the higher as ASB.
 type ASNPeering struct {
-	ID        uuid.UUID `json:"id"`
-	ASA       int       `json:"as_a"`
-	ASB       int       `json:"as_b"`
-	FirstSeen time.Time `json:"first_seen"`
-	LastSeen  time.Time `json:"last_seen"`
+	ID        uuid.UUID
+	ASA       int
+	ASB       int
+	FirstSeen time.Time
+	LastSeen  time.Time
 }
 
 // LiveRoute represents a route in the live routing table
+//
+//nolint:tagliatelle // field names are the existing JSON API
 type LiveRoute struct {
 	ID          uuid.UUID `json:"id"`
 	Prefix      string    `json:"prefix"`
@@ -80,12 +83,16 @@ type LiveRoute struct {
 }
 
 // PrefixDistribution represents the distribution of prefixes by mask length
+//
+//nolint:tagliatelle // field names are the existing JSON API
 type PrefixDistribution struct {
 	MaskLength int `json:"mask_length"`
 	Count      int `json:"count"`
 }
 
 // IPInfo represents comprehensive IP information for the /ip endpoint
+//
+//nolint:tagliatelle // field names are the existing JSON API
 type IPInfo struct {
 	IP         string   `json:"ip"`
 	PTR        []string `json:"ptr,omitempty"`