fix(shared): normalize claude model IDs for anthropic provider (#3290)

Anthropic API accepts claude-opus-4.6 (dot format) but not
claude-opus-4-6 (dash format). Added anthropic case to
transformModelForProvider to normalize dash-format model IDs before
they reach the provider. Updated model config snapshots and test
expectations to match the new dot-format output.

🤖 Generated with OhMyOpenCode assistance
https://github.com/code-yeongyu/oh-my-opencode

src/cli/provider-model-id-transform.test.ts

@@ -163,6 +163,44 @@ describe("transformModelForProvider", () => {
 		})
 	})
 
+	describe("anthropic provider", () => {
+		test("transforms claude-opus-4-6 to claude-opus-4.6", () => {
+			// #given anthropic provider and claude-opus-4-6 model
+			const provider = "anthropic"
+			const model = "claude-opus-4-6"
+
+			// #when transformModelForProvider is called
+			const result = transformModelForProvider(provider, model)
+
+			// #then should transform to claude-opus-4.6
+			expect(result).toBe("claude-opus-4.6")
+		})
+
+		test("transforms claude-sonnet-4-6 to claude-sonnet-4.6", () => {
+			// #given anthropic provider and claude-sonnet-4-6 model
+			const provider = "anthropic"
+			const model = "claude-sonnet-4-6"
+
+			// #when transformModelForProvider is called
+			const result = transformModelForProvider(provider, model)
+
+			// #then should transform to claude-sonnet-4.6
+			expect(result).toBe("claude-sonnet-4.6")
+		})
+
+		test("transforms claude-haiku-4-5 to claude-haiku-4.5", () => {
+			// #given anthropic provider and claude-haiku-4-5 model
+			const provider = "anthropic"
+			const model = "claude-haiku-4-5"
+
+			// #when transformModelForProvider is called
+			const result = transformModelForProvider(provider, model)
+
+			// #then should transform to claude-haiku-4.5
+			expect(result).toBe("claude-haiku-4.5")
+		})
+	})
+
 	describe("unknown provider", () => {
 		test("passes model through unchanged for unknown provider", () => {
 			// #given unknown provider and any model