feat(writing): switch primary model to kimi k2.5, add anti-AI-slop rules to prompt

src/shared/model-requirements.test.ts

@@ -331,19 +331,23 @@ describe("CATEGORY_MODEL_REQUIREMENTS", () => {
     expect(primary.providers[0]).toBe("google")
   })
 
-  test("writing has valid fallbackChain with gemini-3-flash as primary", () => {
+  test("writing has valid fallbackChain with k2p5 as primary (kimi-for-coding)", () => {
     // given - writing category requirement
     const writing = CATEGORY_MODEL_REQUIREMENTS["writing"]
 
     // when - accessing writing requirement
-    // then - fallbackChain exists with gemini-3-flash as first entry
+    // then - fallbackChain: k2p5 → gemini-3-flash → claude-sonnet-4-5
     expect(writing).toBeDefined()
     expect(writing.fallbackChain).toBeArray()
-    expect(writing.fallbackChain.length).toBeGreaterThan(0)
+    expect(writing.fallbackChain).toHaveLength(3)
 
     const primary = writing.fallbackChain[0]
-    expect(primary.model).toBe("gemini-3-flash")
-    expect(primary.providers[0]).toBe("google")
+    expect(primary.model).toBe("k2p5")
+    expect(primary.providers[0]).toBe("kimi-for-coding")
+
+    const second = writing.fallbackChain[1]
+    expect(second.model).toBe("gemini-3-flash")
+    expect(second.providers[0]).toBe("google")
   })
 
   test("all 8 categories have valid fallbackChain arrays", () => {

src/shared/model-requirements.ts

@@ -152,10 +152,9 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   },
   writing: {
     fallbackChain: [
+      { providers: ["kimi-for-coding"], model: "k2p5" },
       { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-flash" },
       { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-sonnet-4-5" },
-      { providers: ["zai-coding-plan"], model: "glm-4.7" },
-      { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2" },
     ],
   },
 }

src/tools/delegate-task/constants.ts

@@ -162,6 +162,16 @@ Approach:
 - Draft with care
 - Polish for clarity and impact
 - Documentation, READMEs, articles, technical writing
+
+ANTI-AI-SLOP RULES (NON-NEGOTIABLE):
+- NEVER use em dashes (—) or en dashes (–). Use commas, periods, ellipses, or line breaks instead. Zero tolerance.
+- Remove AI-sounding phrases: "delve", "it's important to note", "I'd be happy to", "certainly", "please don't hesitate", "leverage", "utilize", "in order to", "moving forward", "circle back", "at the end of the day", "robust", "streamline", "facilitate"
+- Pick plain words. "Use" not "utilize". "Start" not "commence". "Help" not "facilitate".
+- Use contractions naturally: "don't" not "do not", "it's" not "it is".
+- Vary sentence length. Don't make every sentence the same length.
+- NEVER start consecutive sentences with the same word.
+- No filler openings: skip "In today's world...", "As we all know...", "It goes without saying..."
+- Write like a human, not a corporate template.
 </Category_Context>`
 
 export const DEEP_CATEGORY_PROMPT_APPEND = `<Category_Context>
@@ -205,7 +215,7 @@ export const DEFAULT_CATEGORIES: Record<string, CategoryConfig> = {
   quick: { model: "anthropic/claude-haiku-4-5" },
   "unspecified-low": { model: "anthropic/claude-sonnet-4-5" },
   "unspecified-high": { model: "anthropic/claude-opus-4-6", variant: "max" },
-  writing: { model: "google/gemini-3-flash" },
+  writing: { model: "kimi-for-coding/k2p5" },
 }
 
 export const CATEGORY_PROMPT_APPENDS: Record<string, string> = {

src/tools/delegate-task/tools.test.ts

@@ -2794,7 +2794,7 @@ describe("sisyphus-task", () => {
         {
           name: "writing",
           description: "Documentation, prose, technical writing",
-          model: "google/gemini-3-flash",
+          model: "kimi-for-coding/k2p5",
         },
       ]
       const availableSkills = [