Fix all lint issues and update AGENTS.md workflow rules

- Fix stuttering type names (e.g. config.ConfigParams → config.Params)
- Add doc comments to all exported types/functions/methods
- Add package doc comments to all packages
- Fix JSON tags to camelCase
- Extract magic numbers to constants
- Add blank lines per nlreturn/wsl_v5 rules
- Use errors.Is() for error comparison
- Unexport NewLoggingResponseWriter (not used externally)
- Replace for-range on ctx.Done() with channel receive
- Rename unused parameters to _
- AGENTS.md: all changes via feature branches, no direct main commits

internal/logger/logger.go

@@ -9,8 +9,8 @@ import (
 	"go.uber.org/fx"
 )
 
-// LoggerParams defines the dependencies for creating a Logger.
-type LoggerParams struct {
+// Params defines the dependencies for creating a Logger.
+type Params struct {
 	fx.In
 
 	Globals *globals.Globals
@@ -20,11 +20,11 @@ type LoggerParams struct {
 type Logger struct {
 	log    *slog.Logger
 	level  *slog.LevelVar
-	params LoggerParams
+	params Params
 }
 
 // New creates a new Logger with appropriate handler based on terminal detection.
-func New(_ fx.Lifecycle, params LoggerParams) (*Logger, error) {
+func New(_ fx.Lifecycle, params Params) (*Logger, error) {
 	l := new(Logger)
 	l.level = new(slog.LevelVar)
 	l.level.Set(slog.LevelInfo)