feat(kernel): P31 step1 occupation dialogue response bias

- Occupation.biasResponse: deterministic pure remap over Sim.responseFor;
  no occupation = byte-identical pass-through (all intents x personalities).
  farmer AskHelp Refused->Helpful; fisher SmallTalk Reserved->Friendly;
  peddler SmallTalk Reserved->Bargaining; scholar Joke fully overridden to
  Reserved (documented total-override semantics, opposite of personality).
- Sim.responseFor made public (same pure function, reused as the base path).
- Sim.chooseDialogueWith: extracted body of chooseDialogue with an injectable
  respond function; chooseDialogue keeps identity semantics unchanged.
- Sim.appendAnnal made public for the upcoming story annal writes.
- 9 new kernel tests (92 -> 101); performance digest unchanged.

2 files changed, 46 insertions, 4 deletions

diff --git a/src/LivingVillage.Kernel/Occupation.fs b/src/LivingVillage.Kernel/Occupation.fs
index 2168c4e..8ce5060 100644
--- a/src/LivingVillage.Kernel/Occupation.fs
+++ b/src/LivingVillage.Kernel/Occupation.fs
@@ -241,3 +241,34 @@ module Occupation =
     /// Sim.quotePrice 的输出经职业偏置映射；None（无报价）原样穿透。
     let biasedQuote (kind: Kind option) (playerIsBuyer: bool) (baseQuote: float32 option) : float32 option =
         baseQuote |> Option.map (fun price -> price * quoteBiasOf kind playerIsBuyer)
+
+    // ---- 对话分支倾向（design §5 / P-d）：村民对玩家职业的确定性回应偏差 ----
+    // 全部为纯函数重映射：基底仍走 Sim.responseFor 的人格口径，偏差不引入随机。
+    // 无职业（None）= 原回应逐字节不变。
+    // 规则（各自只作用于签名意图，其余意图原样穿透）：
+    //   农夫 AskHelp：Refused → Helpful（老实人家，求助不落空）；
+    //   渔夫 SmallTalk：Reserved → Friendly（聊的是天气鱼汛，冷场变热络）；
+    //   货郎 SmallTalk：Reserved → Bargaining（三句不离买卖，更易进讨价还价）；
+    //   书生 Joke：完全覆盖为 Reserved（读过书的人讲笑话，众人反而拘谨）——
+    //   与 personality 相反时采用完全覆盖语义而非概率偏向，确定性可测（design §5 反差感）。
+    let private remapResponse
+        (kind: Kind)
+        (intent: Sim.DialogueIntent)
+        (baseResponse: Sim.DialogueResponse)
+        : Sim.DialogueResponse =
+        match kind, intent, baseResponse with
+        | Farmer, Sim.AskHelp, Sim.Refused -> Sim.Helpful
+        | Fisher, Sim.SmallTalk, Sim.Reserved -> Sim.Friendly
+        | Peddler, Sim.SmallTalk, Sim.Reserved -> Sim.Bargaining
+        | Scholar, Sim.Joke, _ -> Sim.Reserved
+        | _ -> baseResponse
+
+    let biasResponse
+        (kind: Kind option)
+        (intent: Sim.DialogueIntent)
+        (personality: Sim.Personality)
+        : Sim.DialogueResponse =
+        let baseResponse = Sim.responseFor intent personality
+        match kind with
+        | None -> baseResponse
+        | Some kind -> remapResponse kind intent baseResponse
diff --git a/src/LivingVillage.Kernel/Sim.fs b/src/LivingVillage.Kernel/Sim.fs
index 5c4e107..348a60e 100644
--- a/src/LivingVillage.Kernel/Sim.fs
+++ b/src/LivingVillage.Kernel/Sim.fs
@@ -299,7 +299,8 @@ module Sim =
 
     let clamp (v: float32) (lo: float32) (hi: float32) : float32 = if v < lo then lo elif v > hi then hi else v
 
-    let private appendAnnal (entry: AnnalEntry) (world: World) : World =
+    /// P-d 起对调用方公开（剧情线年鉴写入复用同一裁剪口径，语义不变）。
+    let appendAnnal (entry: AnnalEntry) (world: World) : World =
         { world with Annals = (entry :: world.Annals) |> List.truncate maxAnnalEntries }
 
     let hungerDecayPerTick = 0.0012f
@@ -765,7 +766,8 @@ module Sim =
             { Target = target
               Options = dialogueOptions })
 
-    let private responseFor (intent: DialogueIntent) (personality: Personality) : DialogueResponse =
+    /// 纯人格回应函数；P-d 起对调用方公开，供 Occupation.biasResponse 复用原口径。
+    let responseFor (intent: DialogueIntent) (personality: Personality) : DialogueResponse =
         match intent with
         | SmallTalk -> if personality.Extraversion >= 0.5f then Friendly else Reserved
         | AskHelp -> if personality.Honesty >= 0.4f then Helpful else Refused
@@ -782,7 +784,12 @@ module Sim =
         sprintf "rumor tick=%d source=%A narrator=%A receiver=%A depth=%d"
             rumor.Tick rumor.Source rumor.Narrator rumor.Receiver rumor.Depth
 
-    let chooseDialogue (target: NpcId) (intent: DialogueIntent) (world: World) : DialogueResult =
+    let chooseDialogueWith
+        (respond: DialogueIntent -> Personality -> DialogueResponse)
+        (target: NpcId)
+        (intent: DialogueIntent)
+        (world: World)
+        : DialogueResult =
         match findNpcIndex target world.Npcs with
         | None -> DialogueRejected(DialogueTargetNotFound, world)
         | Some targetIndex ->
@@ -794,7 +801,7 @@ module Sim =
             elif not (dialogueAvailable targetNpc) then
                 DialogueRejected(DialogueTargetUnavailable, world)
             else
-                let response = responseFor intent targetNpc.Mind.Personality
+                let response = respond intent targetNpc.Mind.Personality
                 let outcome =
                     { Tick = world.Tick
                       Actor = playerId
@@ -842,6 +849,10 @@ module Sim =
                         withRumorAnnal
                 DialogueSucceeded(outcome, withDialogueAnnal)
 
+    /// 既有入口：无职业偏差的人格回应路径（identity，与历史行为逐字节一致）。
+    let chooseDialogue (target: NpcId) (intent: DialogueIntent) (world: World) : DialogueResult =
+        chooseDialogueWith responseFor target intent world
+
     let annalText (world: World) : string =
         let rows =
             world.Annals