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diff --git a/src/LivingVillage.Desktop.Tests/P51ProfessionSliceTests.fs b/src/LivingVillage.Desktop.Tests/P51ProfessionSliceTests.fs
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+namespace LivingVillage.Desktop.Tests
+
+open System
+open System.IO
+open Microsoft.VisualStudio.TestTools.UnitTesting
+open LivingVillage.Kernel
+open LivingVillage.Kernel.Sim
+open LivingVillage.Desktop
+
+/// P51 职业系统实现首切片（docs/design-professions.md §1 / §2.4-1）：
+///   (a) 开局钱/体力/背包侧车按所选职业写入，None 用世界默认；
+///   (b) 新档当日任务 = dailyTaskOf(kind)，跨日 refreshOccupationToday 换新任务且 Offered；
+///   (c) StartNewGameWith kind 后菜单与世界可读回职业、当日任务与身份年鉴；
+///   (d) v3 含职业档 round-trip 读回一致，v2（None）仍逐字节一致且无职业。
+[<TestClass>]
+type P51ProfessionSliceTests () =
+
+    let seed = 42UL
+
+    let withTempSave (action: string -> unit) =
+        let suffix = Guid.NewGuid().ToString("N")
+        let path = Path.Combine(Path.GetTempPath(), "living-village-p51-" + suffix + ".save")
+        try
+            action path
+        finally
+            if File.Exists path then File.Delete path
+
+    /// 复刻 Game.StartNewGame 的纯函数路径：建世界（含职业钱/体力/背包/当日任务）+ 身份年鉴。
+    let buildWorld (kind: Occupation.Kind option) (startTick: int64) : World * Occupation.State option =
+        let state = kind |> Option.map (fun k -> WorldBootstrap.occupationStateFor seed k startTick)
+        let baseWorld = WorldBootstrap.initialWorldWithOccupation false seed 4 state
+        let world = { baseWorld with Tick = startTick; Time = float startTick * Sim.dtSeconds }
+        let world = state |> Option.fold (fun current s -> WorldBootstrap.appendIdentityAnnal s current) world
+        world, state
+
+    [<TestMethod>]
+    member _.OpeningResourcesFollowChosenProfession () =
+        let cases =
+            [ Occupation.Farmer, 60.0f, 100.0f, [ Sim.Food, 12 ]
+              Occupation.Fisher, 45.0f, 95.0f, [ Sim.Food, 8; Sim.Fish, 3 ]
+              Occupation.Peddler, 90.0f, 100.0f, [ Sim.Food, 6; Sim.Spice, 4 ]
+              Occupation.Scholar, 70.0f, 100.0f, [ Sim.Food, 10; Sim.Scroll, 2 ] ]
+        for (kind, money, energy, backpack) in cases do
+            let world, state = buildWorld (Some kind) 0L
+            Assert.AreEqual<float32>(money, world.Avatar.Mind.Needs.Money)
+            Assert.AreEqual<float32>(energy, world.Avatar.Mind.Needs.Energy)
+            match state with
+            | Some s ->
+                Assert.AreEqual<(Sim.ItemKind * int) list>(backpack, s.Backpack)
+                Assert.IsTrue((s.Backpack = (Occupation.profileOf kind).InitialInventory), "backpack = initial bundle")
+            | None -> Assert.Fail("occupation state must exist for a chosen profession")
+        // None = 世界默认（不覆盖钱/体力，无背包侧车）
+        let noneWorld, noneState = buildWorld None 0L
+        let defaultNeeds = (Sim.initialWorldN seed 4).Avatar.Mind.Needs
+        Assert.AreEqual<float32>(defaultNeeds.Money, noneWorld.Avatar.Mind.Needs.Money)
+        Assert.AreEqual<float32>(defaultNeeds.Energy, noneWorld.Avatar.Mind.Needs.Energy)
+        Assert.AreEqual<Occupation.State option>(None, noneState)
+
+    [<TestMethod>]
+    member _.BackpackQuantityReadsThroughSidecar () =
+        let state = Occupation.stateOf Occupation.Peddler
+        Assert.AreEqual<int>(6, Occupation.backpackQuantity Sim.Food state)
+        Assert.AreEqual<int>(4, Occupation.backpackQuantity Sim.Spice state)
+        Assert.AreEqual<int>(0, Occupation.backpackQuantity Sim.Scroll state)
+
+    [<TestMethod>]
+    member _.NewGameTodayTaskMatchesDailyTaskOfAndRefreshesAcrossDays () =
+        let kind = Occupation.Fisher
+        let state = WorldBootstrap.occupationStateFor seed kind 0L
+        let day0 = Occupation.dailyTaskOf seed (Occupation.occupationSeedOf kind) 0L kind
+        Assert.AreEqual<Occupation.DailyTask option>(day0, state.Today)
+        Assert.AreEqual<Occupation.TaskState>(Occupation.Offered, state.Today.Value.State)
+        // 同日刷新保留原任务（含终态），不下发新任务
+        let finished =
+            { state with Today = state.Today |> Option.map (fun task -> { task with State = Occupation.Done }) }
+        let sameDay = WorldBootstrap.refreshOccupationToday seed finished 1000L
+        Assert.AreEqual<Occupation.DailyTask option>(finished.Today, sameDay.Today)
+        // 跨日刷新 = 当日 dailyTaskOf，状态 Offered，且与首日任务不同
+        let nextDay = 3L
+        let nextTick = nextDay * Sim.ticksPerDay + 123L
+        let refreshed = WorldBootstrap.refreshOccupationToday seed state nextTick
+        let expected = Occupation.dailyTaskOf seed (Occupation.occupationSeedOf kind) nextDay kind
+        Assert.AreEqual<Occupation.DailyTask option>(expected, refreshed.Today)
+        Assert.AreEqual<Occupation.TaskState>(Occupation.Offered, refreshed.Today.Value.State)
+        Assert.AreNotEqual<Occupation.DailyTask option>(state.Today, refreshed.Today)
+
+    [<TestMethod>]
+    member _.StartNewGameWithProfessionIsReadableFromMenuAndWorld () =
+        let menu = MenuState.openOccupationSelect (MenuState.create SimulationControl.initial false)
+        Assert.AreEqual<MenuPage>(OccupationSelect, menu.Page)
+        let fisherItem = MenuState.move Down (MenuState.move Down menu)
+        Assert.AreEqual<Occupation.Kind option>(Some Occupation.Fisher, MenuState.selectedOccupation fisherItem)
+        let _, command = MenuState.update Confirm fisherItem
+        match command with
+        | StartNewGameWith (Some kind) ->
+            let world, state = buildWorld (Some kind) 0L
+            Assert.AreEqual<Occupation.Kind>(Occupation.Fisher, kind)
+            match state with
+            | Some s ->
+                Assert.AreEqual<Occupation.Kind>(Occupation.Fisher, s.Profile.Kind)
+                Assert.AreEqual<Occupation.DailyTask option>(
+                    Occupation.dailyTaskOf seed (Occupation.occupationSeedOf Occupation.Fisher) 0L Occupation.Fisher,
+                    s.Today)
+                Assert.AreEqual<(Sim.ItemKind * int) list>([ Sim.Food, 8; Sim.Fish, 3 ], s.Backpack)
+                Assert.IsTrue(
+                    world.Annals
+                    |> List.exists (fun entry ->
+                        entry.Kind = Sim.StoryAnnal
+                        && entry.Summary = Occupation.Story.identitySummaryOf Occupation.Fisher),
+                    "identity annal must be readable back")
+            | None -> Assert.Fail("state must carry the chosen profession")
+        | other -> Assert.Fail(sprintf "expected StartNewGameWith(Some Fisher), got %A" other)
+
+    [<TestMethod>]
+    member _.V3SaveRoundTripsBackpackAndV2StaysOccupationFree () =
+        let world, state = buildWorld (Some Occupation.Peddler) 0L
+        let peddlerState =
+            match state with
+            | Some s -> s
+            | None -> failwith "expected occupation state"
+        // v2（None）逐字节一致且读回无职业
+        let v2 = WorldSave.save world
+        Assert.IsTrue(v2.StartsWith("LV_WORLD_SAVE_V2"))
+        match WorldSave.load v2 with
+        | Ok restored -> Assert.AreEqual<string>(v2, WorldSave.save restored)
+        | Error message -> Assert.Fail(message)
+        // v3 round-trip：背包与当日任务读回一致
+        withTempSave (fun path ->
+            WorldSave.saveToFileWith state path world
+            match WorldSave.loadFromFileWith path with
+            | Ok (restored, occupation) ->
+                match occupation with
+                | Some s ->
+                    Assert.AreEqual<(Sim.ItemKind * int) list>(peddlerState.Backpack, s.Backpack)
+                    Assert.AreEqual<Occupation.DailyTask option>(peddlerState.Today, s.Today)
+                    Assert.AreEqual<string>(WorldSave.saveWith state world, WorldSave.saveWith occupation restored)
+                | None -> Assert.Fail("v3 must carry the occupation sidecar")
+            | Error message -> Assert.Fail(message))