feat: GitHub provider lifecycle and onboarding hardening (#351)

* feat: improve GitHub provider onboarding and lifecycle

* fix: address copilot review in provider manager

* fix: address follow-up copilot review comments

* test: resolve rebase conflict in provider profiles suite

* fix: clear stale github hydrated marker

* fix: harden github onboarding auth precedence

* fix: remove merge markers from provider tests

* fix: resolve latest copilot onboarding comments

---------

Co-authored-by: KRATOS <84986124+gnanam1990@users.noreply.github.com>

src/commands/provider/provider.test.tsx

@@ -275,6 +275,21 @@ test('buildCurrentProviderSummary does not relabel local gpt-5.4 providers as Co
   expect(summary.endpointLabel).toBe('http://127.0.0.1:8080/v1')
 })
 
+test('buildCurrentProviderSummary recognizes GitHub Models mode', () => {
+  const summary = buildCurrentProviderSummary({
+    processEnv: {
+      CLAUDE_CODE_USE_GITHUB: '1',
+      OPENAI_MODEL: 'github:copilot',
+      OPENAI_BASE_URL: 'https://models.github.ai/inference',
+    },
+    persisted: null,
+  })
+
+  expect(summary.providerLabel).toBe('GitHub Models')
+  expect(summary.modelLabel).toBe('github:copilot')
+  expect(summary.endpointLabel).toBe('https://models.github.ai/inference')
+})
+
 test('getProviderWizardDefaults ignores poisoned current provider values', () => {
   const defaults = getProviderWizardDefaults({
     OPENAI_API_KEY: 'sk-secret-12345678',