Re-vendor the canonical files from sneak/prompts at dd4027b (closes #112)

The shared files are fetched from sneak/prompts dd4027b, with this
repository's own entries after the shared content in .gitignore,
.editorconfig and .dockerignore.

Lint and tests are Dockerfile phases (golangci-lint v2.14.0, Debian Go
1.24.13) that the build stage depends on, and the Makefile targets call
the script/ entrypoints. make fmt also formats Markdown with prettier.

Fixes for the new lint findings: the auth cookie is always Secure, an
IRC connection's relay goroutine stops when the connection closes, and
repeated strings are constants.

Model: opus-5-5

internal/db/queries.go

@@ -1150,7 +1150,8 @@ func scanMessages(
 			code, _ := strconv.Atoi(msg.Command)
 			msg.Code = code
 
-			if mt, err := irc.FromInt(code); err == nil {
+			mt, lookupErr := irc.FromInt(code)
+			if lookupErr == nil {
 				msg.Command = mt.Name()
 			}
 		}
@@ -1373,7 +1374,9 @@ func (database *Database) GetStaleOrphanSessions(
 
 	for rows.Next() {
 		var stale StaleSession
-		if err := rows.Scan(&stale.ID, &stale.Nick); err != nil {
+
+		err = rows.Scan(&stale.ID, &stale.Nick)
+		if err != nil {
 			return nil, fmt.Errorf(
 				"scan stale session: %w", err,
 			)
@@ -1382,7 +1385,8 @@ func (database *Database) GetStaleOrphanSessions(
 		result = append(result, stale)
 	}
 
-	if err := rows.Err(); err != nil {
+	err = rows.Err()
+	if err != nil {
 		return nil, fmt.Errorf(
 			"iterate stale sessions: %w", err,
 		)
@@ -1905,9 +1909,10 @@ func (database *Database) ListChannelBans(
 	for rows.Next() {
 		var ban BanInfo
 
-		if scanErr := rows.Scan(
+		scanErr := rows.Scan(
 			&ban.Mask, &ban.SetBy, &ban.CreatedAt,
-		); scanErr != nil {
+		)
+		if scanErr != nil {
 			return nil, fmt.Errorf(
 				"scan channel ban: %w", scanErr,
 			)
@@ -1916,7 +1921,8 @@ func (database *Database) ListChannelBans(
 		bans = append(bans, ban)
 	}
 
-	if rowErr := rows.Err(); rowErr != nil {
+	rowErr := rows.Err()
+	if rowErr != nil {
 		return nil, fmt.Errorf(
 			"iterate channel bans: %w", rowErr,
 		)
@@ -2247,11 +2253,12 @@ func (database *Database) ListAllChannelsWithCountsFiltered(
 	for rows.Next() {
 		var chanInfo ChannelInfoFull
 
-		if scanErr := rows.Scan(
+		scanErr := rows.Scan(
 			&chanInfo.Name,
 			&chanInfo.MemberCount,
 			&chanInfo.Topic,
-		); scanErr != nil {
+		)
+		if scanErr != nil {
 			return nil, fmt.Errorf(
 				"scan channel: %w", scanErr,
 			)
@@ -2260,7 +2267,8 @@ func (database *Database) ListAllChannelsWithCountsFiltered(
 		channels = append(channels, chanInfo)
 	}
 
-	if rowErr := rows.Err(); rowErr != nil {
+	rowErr := rows.Err()
+	if rowErr != nil {
 		return nil, fmt.Errorf(
 			"iterate channels: %w", rowErr,
 		)
@@ -2308,11 +2316,12 @@ func (database *Database) GetSessionChannelsFiltered(
 	for rows.Next() {
 		var chanInfo ChannelInfo
 
-		if scanErr := rows.Scan(
+		scanErr := rows.Scan(
 			&chanInfo.ID,
 			&chanInfo.Name,
 			&chanInfo.Topic,
-		); scanErr != nil {
+		)
+		if scanErr != nil {
 			return nil, fmt.Errorf(
 				"scan channel: %w", scanErr,
 			)
@@ -2321,7 +2330,8 @@ func (database *Database) GetSessionChannelsFiltered(
 		channels = append(channels, chanInfo)
 	}
 
-	if rowErr := rows.Err(); rowErr != nil {
+	rowErr := rows.Err()
+	if rowErr != nil {
 		return nil, fmt.Errorf(
 			"iterate channels: %w", rowErr,
 		)