refactor(model-core): host snapshot fetcher, suggestion parser, and context-limit resolver

Move three pure helpers from src/shared/ into @oh-my-opencode/model-core so the package can stand alone without depending on plugin internals:

- buildModelCapabilitiesSnapshotFromModelsDev + fetchModelCapabilitiesSnapshot (models.dev normalization)
- parseModelSuggestion (cross-provider ProviderModelNotFoundError suggestion extraction)
- resolveActualContextLimit (Anthropic GA 1M context override)

Split provider-model-id-transform into two variants exposed by model-core:

- transformModelForProvider keeps the runtime dash to dot Anthropic rewrite used by the SDK
- transformModelForProviderDisplay preserves hyphenated Anthropic IDs so the installer writes registry-compatible model strings, fixing the ProviderModelNotFoundError fresh installs hit when the dotted form leaks into the config

src/shared/* and src/cli/provider-model-id-transform.ts collapse to re-export shims that point at the new core modules. Stale src/shared/{known-variants,model-capability-aliases,model-capability-guardrails,model-capability-heuristics}.ts re-export files plus the duplicated context-limit-resolver test are removed in favor of the canonical model-core copies.

Tests: bun test packages/model-core src/shared/model-capabilities-cache.test.ts src/cli/provider-model-id-transform.test.ts

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

@@ -1,7 +1,9 @@
 import { describe, expect, test } from "bun:test"
 
-import { transformModelForProvider } from "./provider-model-id-transform"
-import { transformModelForProvider as transformSharedModelForProvider } from "../shared/provider-model-id-transform"
+import {
+  transformModelForProvider as transformRuntimeModelForProvider,
+  transformModelForProviderDisplay as transformModelForProvider,
+} from "@oh-my-opencode/model-core"
 
 describe("transformModelForProvider", () => {
   describe("github-copilot provider", () => {
@@ -338,16 +340,28 @@ describe("transformModelForProvider", () => {
     })
   })
 
-  test("uses a CLI-local transform implementation distinct from the shared runtime transform", () => {
-    // #given the CLI transform (used by the installer) and the shared runtime transform
+  test("uses separate display and runtime transform implementations", () => {
+    // #given the display transform (used by the installer) and the runtime transform
     const cliResult = transformModelForProvider("anthropic", "claude-opus-4-7")
-    const sharedResult = transformSharedModelForProvider("anthropic", "claude-opus-4-7")
+    const runtimeResult = transformRuntimeModelForProvider("anthropic", "claude-opus-4-7")
+    const nonAnthropicScenarios = [
+      { provider: "openai", model: "gpt-4o" },
+      { provider: "google", model: "gemini-2.5-pro" },
+      { provider: "github-copilot", model: "gemini-3-flash" },
+      { provider: "vercel", model: "claude-opus-4-7" },
+    ] as const
 
     // #when both are called with the same anthropic claude input
     // #then the CLI preserves hyphenated form for config output,
     //       the shared runtime transform converts dash→dot for API calls
-    expect(transformModelForProvider).not.toBe(transformSharedModelForProvider)
+    expect(transformModelForProvider).not.toBe(transformRuntimeModelForProvider)
     expect(cliResult).toBe("claude-opus-4-7")
-    expect(sharedResult).toBe("claude-opus-4.7")
+    expect(runtimeResult).toBe("claude-opus-4.7")
+
+    for (const scenario of nonAnthropicScenarios) {
+      expect(transformModelForProvider(scenario.provider, scenario.model)).toBe(
+        transformRuntimeModelForProvider(scenario.provider, scenario.model),
+      )
+    }
   })
 })

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

@@ -1,66 +1 @@
-function inferSubProvider(model: string): string | undefined {
-  if (model.startsWith("claude-")) return "anthropic"
-  if (model.startsWith("gpt-")) return "openai"
-  if (model.startsWith("gemini-")) return "google"
-  if (model.startsWith("grok-")) return "xai"
-  if (model.startsWith("minimax-")) return "minimax"
-  if (model.startsWith("kimi-")) return "moonshotai"
-  if (model.startsWith("glm-")) return "zai"
-  return undefined
-}
-
-const CLAUDE_VERSION_DOT = /claude-(\w+)-(\d+)-(\d+)/g
-const GEMINI_31_PRO_PREVIEW = /gemini-3\.1-pro(?!-)/g
-const GEMINI_3_FLASH_PREVIEW = /gemini-3-flash(?!-)/g
-
-function claudeVersionDot(model: string): string {
-  return model.replace(CLAUDE_VERSION_DOT, "claude-$1-$2.$3")
-}
-
-function applyGatewayTransforms(model: string): string {
-  return claudeVersionDot(model).replace(
-    GEMINI_31_PRO_PREVIEW,
-    "gemini-3.1-pro-preview",
-  )
-}
-
-export function transformModelForProvider(provider: string, model: string): string {
-  if (provider === "vercel") {
-    const slashIndex = model.indexOf("/")
-    if (slashIndex !== -1) {
-      const subProvider = model.substring(0, slashIndex)
-      const subModel = model.substring(slashIndex + 1)
-      return `${subProvider}/${applyGatewayTransforms(subModel)}`
-    }
-
-    const subProvider = inferSubProvider(model)
-    if (subProvider) {
-      return `${subProvider}/${applyGatewayTransforms(model)}`
-    }
-
-    return model
-  }
-
-  if (provider === "github-copilot") {
-    return claudeVersionDot(model)
-      .replace(GEMINI_31_PRO_PREVIEW, "gemini-3.1-pro-preview")
-      .replace(GEMINI_3_FLASH_PREVIEW, "gemini-3-flash-preview")
-  }
-
-  if (provider === "google") {
-    return model
-      .replace(GEMINI_31_PRO_PREVIEW, "gemini-3.1-pro-preview")
-      .replace(GEMINI_3_FLASH_PREVIEW, "gemini-3-flash-preview")
-  }
-
-  if (provider === "anthropic") {
-    // Installer writes hyphenated IDs (claude-opus-4-7) to the config. The
-    // runtime provider-model-id-transform converts dash→dot when calling the
-    // Anthropic API. Keeping the dotted form in the config breaks fresh
-    // installs with ProviderModelNotFoundError because Anthropic's provider
-    // registers models under hyphenated IDs.
-    return model
-  }
-
-  return model
-}
+export { transformModelForProviderDisplay as transformModelForProvider } from "@oh-my-opencode/model-core"