feat(model-requirements): update unspecified-high to gpt-5.4, add glm-5/k2p5/kimi-k2.5 fallbacks

🤖 Generated with assistance of [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/shared/model-requirements.test.ts

@@ -311,20 +311,20 @@ describe("CATEGORY_MODEL_REQUIREMENTS", () => {
     expect(primary.providers[0]).toBe("anthropic")
   })
 
-  test("unspecified-high has claude-opus-4-6 as primary", () => {
+  test("unspecified-high has gpt-5.4 as primary", () => {
     // #given - unspecified-high category requirement
     const unspecifiedHigh = CATEGORY_MODEL_REQUIREMENTS["unspecified-high"]
 
     // #when - accessing unspecified-high requirement
-    // #then - claude-opus-4-6 is first
+    // #then - gpt-5.4 is first
     expect(unspecifiedHigh).toBeDefined()
     expect(unspecifiedHigh.fallbackChain).toBeArray()
     expect(unspecifiedHigh.fallbackChain.length).toBeGreaterThan(1)
 
     const primary = unspecifiedHigh.fallbackChain[0]
-    expect(primary.model).toBe("claude-opus-4-6")
-    expect(primary.variant).toBe("max")
-    expect(primary.providers).toEqual(["anthropic", "github-copilot", "opencode"])
+    expect(primary.model).toBe("gpt-5.4")
+    expect(primary.variant).toBe("high")
+    expect(primary.providers).toEqual(["openai", "github-copilot", "opencode"])
   })
 
   test("artistry has valid fallbackChain with gemini-3.1-pro as primary", () => {