feat(athena): update council member candidates with upgraded models

- Claude sonnet → opus 4.6, GPT 5.2 → 5.3 codex, Gemini flash → pro preview
- Replace copilot/opencode-zen candidates with kimi-for-coding/k2p5
- Update test cases and regenerate model-fallback snapshots
- All 2688 tests pass, typecheck clean

src/cli/__snapshots__/model-fallback.test.ts.snap

@@ -550,16 +550,16 @@ exports[`generateModelConfig all native providers uses preferred models from fal
       "council": {
         "members": [
           {
-            "model": "anthropic/claude-sonnet-4-5",
+            "model": "anthropic/claude-opus-4-6",
-            "name": "Claude",
+            "name": "Claude Opus 4.6",
           },
           {
-            "model": "openai/gpt-5.2",
+            "model": "openai/gpt-5.3-codex",
-            "name": "GPT",
+            "name": "GPT 5.3 Codex",
           },
           {
-            "model": "google/gemini-3-flash",
+            "model": "google/gemini-3-pro-preview",
-            "name": "Gemini",
+            "name": "Gemini Pro 3",
           },
         ],
       },
@@ -774,16 +774,16 @@ exports[`generateModelConfig all native providers uses preferred models with isM
       "council": {
         "members": [
           {
-            "model": "anthropic/claude-sonnet-4-5",
+            "model": "anthropic/claude-opus-4-6",
-            "name": "Claude",
+            "name": "Claude Opus 4.6",
           },
           {
-            "model": "openai/gpt-5.2",
+            "model": "openai/gpt-5.3-codex",
-            "name": "GPT",
+            "name": "GPT 5.3 Codex",
           },
           {
-            "model": "google/gemini-3-flash",
+            "model": "google/gemini-3-pro-preview",
-            "name": "Gemini",
+            "name": "Gemini Pro 3",
           },
         ],
       },
@@ -1965,18 +1965,6 @@ exports[`generateModelConfig mixed provider scenarios uses Claude + OpenCode Zen
   "$schema": "https://raw.githubusercontent.com/code-yeongyu/oh-my-openagent/dev/assets/oh-my-opencode.schema.json",
   "agents": {
     "athena": {
-      "council": {
-        "members": [
-          {
-            "model": "anthropic/claude-sonnet-4-5",
-            "name": "Claude",
-          },
-          {
-            "model": "opencode/claude-sonnet-4-5",
-            "name": "OpenCode Claude",
-          },
-        ],
-      },
       "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
@@ -2266,18 +2254,6 @@ exports[`generateModelConfig mixed provider scenarios uses OpenAI + Copilot comb
   "$schema": "https://raw.githubusercontent.com/code-yeongyu/oh-my-openagent/dev/assets/oh-my-opencode.schema.json",
   "agents": {
     "athena": {
-      "council": {
-        "members": [
-          {
-            "model": "openai/gpt-5.2",
-            "name": "GPT",
-          },
-          {
-            "model": "github-copilot/gpt-5.2",
-            "name": "Copilot GPT",
-          },
-        ],
-      },
       "model": "github-copilot/claude-opus-4.6",
       "variant": "max",
     },
@@ -2629,12 +2605,12 @@ exports[`generateModelConfig mixed provider scenarios uses Gemini + Claude combi
       "council": {
         "members": [
           {
-            "model": "anthropic/claude-sonnet-4-5",
+            "model": "anthropic/claude-opus-4-6",
-            "name": "Claude",
+            "name": "Claude Opus 4.6",
           },
           {
-            "model": "google/gemini-3-flash",
+            "model": "google/gemini-3-pro-preview",
-            "name": "Gemini",
+            "name": "Gemini Pro 3",
           },
         ],
       },
@@ -2778,18 +2754,6 @@ exports[`generateModelConfig mixed provider scenarios uses all fallback provider
   "$schema": "https://raw.githubusercontent.com/code-yeongyu/oh-my-openagent/dev/assets/oh-my-opencode.schema.json",
   "agents": {
     "athena": {
-      "council": {
-        "members": [
-          {
-            "model": "github-copilot/gpt-5.2",
-            "name": "Copilot GPT",
-          },
-          {
-            "model": "opencode/claude-sonnet-4-5",
-            "name": "OpenCode Claude",
-          },
-        ],
-      },
       "model": "github-copilot/claude-opus-4.6",
       "variant": "max",
     },
@@ -3188,24 +3152,16 @@ exports[`generateModelConfig mixed provider scenarios uses all providers togethe
       "council": {
         "members": [
           {
-            "model": "anthropic/claude-sonnet-4-5",
+            "model": "anthropic/claude-opus-4-6",
-            "name": "Claude",
+            "name": "Claude Opus 4.6",
           },
           {
-            "model": "openai/gpt-5.2",
+            "model": "openai/gpt-5.3-codex",
-            "name": "GPT",
+            "name": "GPT 5.3 Codex",
           },
           {
-            "model": "google/gemini-3-flash",
+            "model": "google/gemini-3-pro-preview",
-            "name": "Gemini",
+            "name": "Gemini Pro 3",
-          },
-          {
-            "model": "github-copilot/gpt-5.2",
-            "name": "Copilot GPT",
-          },
-          {
-            "model": "opencode/claude-sonnet-4-5",
-            "name": "OpenCode Claude",
           },
         ],
       },
@@ -3770,24 +3726,16 @@ exports[`generateModelConfig mixed provider scenarios uses all providers with is
       "council": {
         "members": [
           {
-            "model": "anthropic/claude-sonnet-4-5",
+            "model": "anthropic/claude-opus-4-6",
-            "name": "Claude",
+            "name": "Claude Opus 4.6",
           },
           {
-            "model": "openai/gpt-5.2",
+            "model": "openai/gpt-5.3-codex",
-            "name": "GPT",
+            "name": "GPT 5.3 Codex",
           },
           {
-            "model": "google/gemini-3-flash",
+            "model": "google/gemini-3-pro-preview",
-            "name": "Gemini",
+            "name": "Gemini Pro 3",
-          },
-          {
-            "model": "github-copilot/gpt-5.2",
-            "name": "Copilot GPT",
-          },
-          {
-            "model": "opencode/claude-sonnet-4-5",
-            "name": "OpenCode Claude",
           },
         ],
       },

src/cli/council-members-generator.test.ts

@@ -77,27 +77,29 @@ describe("generateCouncilMembers", () => {
   })
 
   //#given only one native provider
-  //#when copilot is also available
+  //#when kimi is also available
-  //#then returns 2 members (native + copilot)
+  //#then returns 2 members (native + kimi)
-  test("uses copilot as second member when only one native provider", () => {
+  test("uses kimi as second member when only one native provider", () => {
     const members = generateCouncilMembers(makeAvail({
       native: { claude: true },
-      copilot: true,
+      kimiForCoding: true,
     }))
 
-    expect(members.length).toBeGreaterThanOrEqual(2)
+    expect(members).toHaveLength(2)
+    expect(members.some(m => m.model.startsWith("anthropic/"))).toBe(true)
+    expect(members.some(m => m.model.startsWith("kimi-for-coding/"))).toBe(true)
   })
 
-  //#given only one native provider
+  //#given all 4 candidates available
-  //#when opencode zen is also available
+  //#when generating council members
-  //#then returns 2 members
+  //#then returns 4 members
-  test("uses opencode zen as second member when only one native provider", () => {
+  test("returns 4 members when all candidates available", () => {
     const members = generateCouncilMembers(makeAvail({
-      native: { gemini: true },
+      native: { claude: true, openai: true, gemini: true },
-      opencodeZen: true,
+      kimiForCoding: true,
     }))
 
-    expect(members.length).toBeGreaterThanOrEqual(2)
+    expect(members).toHaveLength(4)
   })
 
   //#given no providers at all

src/cli/council-members-generator.ts

@@ -12,29 +12,24 @@ const COUNCIL_CANDIDATES: Array<{
 }> = [
   {
     provider: (a) => a.native.claude,
-    model: "anthropic/claude-sonnet-4-5",
+    model: "anthropic/claude-opus-4-6",
-    name: "Claude",
+    name: "Claude Opus 4.6",
   },
   {
     provider: (a) => a.native.openai,
-    model: "openai/gpt-5.2",
+    model: "openai/gpt-5.3-codex",
-    name: "GPT",
+    name: "GPT 5.3 Codex",
   },
   {
     provider: (a) => a.native.gemini,
-    model: "google/gemini-3-flash",
+    model: "google/gemini-3-pro-preview",
-    name: "Gemini",
+    name: "Gemini Pro 3",
   },
   {
-    provider: (a) => a.copilot,
+    provider: (a) => a.kimiForCoding,
-    model: "github-copilot/gpt-5.2",
+    model: "kimi-for-coding/k2p5",
-    name: "Copilot GPT",
+    name: "Kimi 2.5",
-  },
+  }
-  {
-    provider: (a) => a.opencodeZen,
-    model: "opencode/claude-sonnet-4-5",
-    name: "OpenCode Claude",
-  },
 ]
 
 export function generateCouncilMembers(avail: ProviderAvailability): CouncilMember[] {