chore: fix all hlint warnings, update AGENTS.md pre-commit checklist

- Fix 8 hlint hints across 6 files (unused pragma, newtype, lambda, redundant brackets/\$)
- Add blank line after LANGUAGE pragma in Route.hs (fourmolu)
- Fix HouseholdFormData deriving to use explicit strategies for newtype
- Update AGENTS.md: require hlint clean before every commit, add pre-commit checklist
  (format, lint, build, test), update NB CSS URL to jsdelivr CDN

AGENTS.md

@@ -21,7 +21,12 @@ Hyperbole, a serverside web framework. There is zero application JavaScript.
 ## Haskell Conventions
 
 - **Style:** fourmolu-formatted. Run `./hs fourmolu --mode inplace app/ src/ test/` before committing.
-- **Lint:** hlint clean required. Fix any hints before committing.
+- **Lint:** hlint clean required — MUST run `./hs hlint app/ src/ test/` and fix all hints before committing. Zero hints is the standard. Do not suppress or ignore hlint suggestions.
+- **Pre-commit checklist:** Before every commit, run:
+  1. `./hs fourmolu --mode inplace app/ src/ test/` — format code
+  2. `./hs hlint app/ src/ test/` — fix ALL hints (must output "No hints")
+  3. `./hs stack build --fast` — must compile with zero errors
+  4. `./hs stack test --fast` — all tests must pass
 - **Warnings:** `-Wall -Werror` in `package.yaml`. All warnings are fatal.
 - **Module qualifiers:** Use qualified imports with descriptive aliases
   (e.g., `import Data.Text qualified as T`).
@@ -37,8 +42,7 @@ Hyperbole, a serverside web framework. There is zero application JavaScript.
 
 - **Framework:** [Hyperbole](https://github.com/seanhess/hyperbole) — Haskell
   serverside web framework. All HTML rendered in Haskell.
-- **CSS:** [Neo Brutalism](https://unpkg.com/neobrutalismcss@latest) CDN +
+- **CSS:** [Neo Brutalism](https://github.com/matifandy8/NeoBrutalismCSS) CDN via jsdelivr + `frontend/static/style.css` for custom styles.
-  `frontend/static/style.css` for custom styles.
 - **Build:** No npm/build step for frontend. All pages rendered in Haskell.
 - **Interactive components:** HyperViews with typed Actions and server-side
   updates via VirtualDOM over WebSocket.
@@ -86,5 +90,6 @@ sis/
 - Run `./scripts/test` before committing. Tests must pass.
 
 ## Agent Autonomy
+- Run `./hs hlint app/ src/ test/` and fix ALL hints before committing.
 - As changes are completed then verify functionality using Playwright
 - Once functionality is confirmed then commit and push changes

src/Sis/Page/Activity.hs

@@ -17,7 +17,7 @@ import Effectful
 
 import Sis.Database
 import Sis.Route
-import Sis.Style (nbBoxClass, nbButtonDefaultClass, nbInputClass, nbLabelClass, nbBadgeClass, nbHeadingClass, nbContainerClass, nbListItemClass, colorRed, colorYellow, colorGreen)
+import Sis.Style (colorGreen, colorRed, colorYellow, nbBadgeClass, nbBoxClass, nbButtonDefaultClass, nbContainerClass, nbHeadingClass, nbInputClass, nbLabelClass, nbListItemClass)
 import Sis.Types
 import Sis.View.Layout
 import Web.Hyperbole

src/Sis/Page/Chores.hs

@@ -18,7 +18,7 @@ import Effectful
 
 import Sis.Database
 import Sis.Route
-import Sis.Style (nbBoxClass, nbButtonDefaultClass, nbInputClass, nbLabelClass, nbBadgeClass, nbHeadingClass, nbContainerClass, nbListItemClass, colorRed, colorYellow, colorGreen)
+import Sis.Style (colorGreen, colorRed, colorYellow, nbBadgeClass, nbBoxClass, nbButtonDefaultClass, nbContainerClass, nbHeadingClass, nbInputClass, nbLabelClass, nbListItemClass)
 import Sis.Types
 import Sis.View.Layout
 import Web.Hyperbole
@@ -86,7 +86,7 @@ scheduleLabel ScheduleSometime = "Sometime"
 scheduleLabel (ScheduleOneOff d _) = "One-off on " <> T.pack (show d)
 scheduleLabel (ScheduleRecurring p _ mt _ _) =
     let pText = case p of PeriodDaily -> "daily"; PeriodWeekly -> "weekly"; PeriodMonthly -> "monthly"
-        timePart = maybe "" (\t -> " at " <> t) mt
+        timePart = maybe "" (" at " <>) mt
      in "Recurs " <> pText <> timePart
 
 page :: (Hyperbole :> es, DB :> es, IOE :> es) => Page es '[ChoresPage]

src/Sis/Page/Dashboard.hs

@@ -19,7 +19,7 @@ import Effectful
 
 import Sis.Database
 import Sis.Route
-import Sis.Style (nbBoxClass, nbButtonDefaultClass, nbInputClass, nbLabelClass, nbBadgeClass, nbHeadingClass, nbContainerClass, nbListItemClass, colorRed, colorYellow, colorGreen)
+import Sis.Style (colorGreen, colorRed, colorYellow, nbBadgeClass, nbBoxClass, nbButtonDefaultClass, nbContainerClass, nbHeadingClass, nbInputClass, nbLabelClass, nbListItemClass)
 import Sis.Types
 import Sis.View.Layout
 import Web.Hyperbole

src/Sis/Page/Household.hs

@@ -17,7 +17,7 @@ import Effectful
 
 import Sis.Database
 import Sis.Route
-import Sis.Style (nbBoxClass, nbButtonDefaultClass, nbInputClass, nbLabelClass, nbBadgeClass, nbHeadingClass, nbContainerClass, nbListItemClass, colorRed, colorYellow, colorGreen)
+import Sis.Style (colorGreen, colorRed, colorYellow, nbBadgeClass, nbBoxClass, nbButtonDefaultClass, nbContainerClass, nbHeadingClass, nbInputClass, nbLabelClass, nbListItemClass)
 import Sis.Types
 import Sis.View.Layout
 import Web.Hyperbole
@@ -43,7 +43,7 @@ instance (DB :> es, IOE :> es) => HyperView HouseholdPage es where
             Just us -> do
                 hhs <- getUserHouseholds (UserId (usUserId us))
                 case hhs of
-                    [] -> pure (noHouseholdView)
+                    [] -> pure noHouseholdView
                     (h : _) -> do
                         let hid = unHouseholdId (householdId h)
                         mems <- getMembers hid
@@ -123,7 +123,7 @@ page = do
         Just us -> do
             hhs <- getUserHouseholds (UserId (usUserId us))
             case hhs of
-                [] -> pure $ hyper HouseholdPage $ noHouseholdView
+                [] -> pure $ hyper HouseholdPage noHouseholdView
                 (h : _) -> do
                     let hid = unHouseholdId (householdId h)
                     mems <- getMembers hid

src/Sis/Page/Login.hs

@@ -17,7 +17,7 @@ import Effectful
 import Sis.Auth (generateToken, hashPassword, verifyPassword)
 import Sis.Database
 import Sis.Route
-import Sis.Style (nbBoxClass, nbButtonDefaultClass, nbInputClass, nbLabelClass, nbBadgeClass, nbHeadingClass, nbContainerClass, nbListItemClass, colorRed, colorYellow, colorGreen)
+import Sis.Style (colorGreen, colorRed, colorYellow, nbBadgeClass, nbBoxClass, nbButtonDefaultClass, nbContainerClass, nbHeadingClass, nbInputClass, nbLabelClass, nbListItemClass)
 import Sis.Types
 import Sis.View.Layout
 import Web.Hyperbole
@@ -41,7 +41,7 @@ instance (DB :> es, IOE :> es) => HyperView LoginPage es where
             Just u
                 | verifyPassword (lfPassword formData') (userPasswordHash u) -> do
                     saveSession (UserSession (unUserId (userId u)))
-                    pure (loginSuccessView)
+                    pure loginSuccessView
             _ -> pure (loginView (Just "Invalid email or password"))
     update Noop = pure (loginView Nothing)
 

src/Sis/Page/Signup.hs

@@ -18,7 +18,7 @@ import Effectful
 import Sis.Auth (generateToken, hashPassword, verifyPassword)
 import Sis.Database
 import Sis.Route
-import Sis.Style (nbBoxClass, nbButtonDefaultClass, nbInputClass, nbLabelClass, nbBadgeClass, nbHeadingClass, nbContainerClass, nbListItemClass, colorRed, colorYellow, colorGreen)
+import Sis.Style (colorGreen, colorRed, colorYellow, nbBadgeClass, nbBoxClass, nbButtonDefaultClass, nbContainerClass, nbHeadingClass, nbInputClass, nbLabelClass, nbListItemClass)
 import Sis.Types
 import Sis.View.Layout
 import Web.Hyperbole
@@ -49,7 +49,7 @@ instance (DB :> es, IOE :> es) => HyperView SignupPage es where
                                 pwHash <- liftIO (hashPassword (sfPassword form))
                                 uid <- createUser (sfDisplayName form) (sfEmail form) pwHash
                                 saveSession (UserSession (unUserId uid))
-                                pure (signupSuccessView)
+                                pure signupSuccessView
 
 signupSuccessView :: View SignupPage ()
 signupSuccessView = do

src/Sis/Route.hs

@@ -1,5 +1,4 @@
 {-# LANGUAGE DeriveGeneric #-}
-{-# LANGUAGE OverloadedStrings #-}
 
 module Sis.Route (AppRoute (..)) where
 

src/Sis/Style.hs

@@ -1,12 +1,22 @@
 {-# LANGUAGE OverloadedStrings #-}
 
--- | Neo Brutalism CSS class name constants for Hyperbole views.
+{- | Neo Brutalism CSS class name constants for Hyperbole views.
--- Based on https://github.com/matifandy8/NeoBrutalismCSS
+Based on https://github.com/matifandy8/NeoBrutalismCSS
-module Sis.Style
+-}
-    ( nbBoxClass, nbButtonDefaultClass, nbInputClass, nbLabelClass
+module Sis.Style (
-    , nbBadgeClass, nbHeadingClass
+    nbBoxClass,
-    , nbNavbarClass, nbNavbarLinkClass, nbContainerClass, nbListItemClass
+    nbButtonDefaultClass,
-    , colorRed, colorYellow, colorGreen
+    nbInputClass,
+    nbLabelClass,
+    nbBadgeClass,
+    nbHeadingClass,
+    nbNavbarClass,
+    nbNavbarLinkClass,
+    nbContainerClass,
+    nbListItemClass,
+    colorRed,
+    colorYellow,
+    colorGreen,
 ) where
 
 import Data.Text (Text)

src/Sis/Types.hs

@@ -292,7 +292,8 @@ data ActivityFormData = ActivityFormData
     }
     deriving (Show, Eq, Generic, FromForm)
 
-data HouseholdFormData = HouseholdFormData
+newtype HouseholdFormData = HouseholdFormData
     { hfdName :: Text
     }
-    deriving (Show, Eq, Generic, FromForm)
+    deriving stock (Show, Eq, Generic)
+    deriving anyclass (FromForm)

src/Sis/View/Layout.hs

@@ -15,7 +15,7 @@ import Data.Text (Text)
 import GHC.Generics (Generic)
 
 import Sis.Route
-import Sis.Style (nbNavbarClass, nbNavbarLinkClass, nbHeadingClass, nbButtonDefaultClass)
+import Sis.Style (nbButtonDefaultClass, nbHeadingClass, nbNavbarClass, nbNavbarLinkClass)
 import Web.Hyperbole
 import Web.Hyperbole.Effect.Session
 
@@ -23,7 +23,7 @@ import Web.Hyperbole.Effect.Session
 -- Session
 ----------------------------------------------------------------------
 
-data UserSession = UserSession
+newtype UserSession = UserSession
     { usUserId :: Int
     }
     deriving stock (Show, Eq, Generic)