feat(api): improve local provider reliability with readiness and self-healing (#738)

* feat(api): classify openai-compatible provider failures

* Update src/services/api/providerConfig.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update src/services/api/errors.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* feat(api): harden openai-compatible diagnostics and env fallback

* Update src/services/api/openaiShim.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update src/services/api/openaiShim.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update src/services/api/errors.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update src/services/api/errors.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* fix openaiShim duplicate requests and diagnostics

* remove unused url from http failure classifier

* dedupe env diagnostic warnings

* Remove hardcoded URLs from OpenAI error tests

Removed hardcoded URLs from network failure classification tests.

* Update providerConfig.envDiagnostics.test.ts

* fix(openai-shim): return successful responses and restore localhost classifier tests

* Update src/services/api/openaiShim.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update src/services/api/openaiShim.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update src/services/api/openaiShim.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* feat(provider): add truthful local generation readiness checks

Implement Phase 2 provider readiness behavior by adding structured Ollama generation probes, wiring setup flows to readiness states, extending system-check with generation readiness output, and updating focused tests.

* feat(api): add local self-healing fallback retries

Implement Phase 3 self-healing behavior for local OpenAI-compatible providers: retry base URL fallbacks for localhost resolution and endpoint mismatches, plus capability-gated toolless retry for tool-incompatible local models; include diagnostics and focused tests.

* fix(api): address review blockers for local provider reliability

* Update src/utils/providerDiscovery.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update src/services/api/openaiShim.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* fix: harden readiness probes and cross-platform test stability

* fix: refresh toolless retry payload and stabilize osc clipboard test

* fix: harden Ollama readiness parsing and redact provider URLs

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

src/services/api/providerConfig.local.test.ts

@@ -2,8 +2,10 @@ import { afterEach, expect, test } from 'bun:test'
 
 import {
   getAdditionalModelOptionsCacheScope,
+  getLocalProviderRetryBaseUrls,
   isLocalProviderUrl,
   resolveProviderRequest,
+  shouldAttemptLocalToollessRetry,
 } from './providerConfig.js'
 
 const originalEnv = {
@@ -83,3 +85,42 @@ test('skips local model cache scope for remote openai-compatible providers', ()
 
   expect(getAdditionalModelOptionsCacheScope()).toBeNull()
 })
+
+test('derives local retry base URLs with /v1 and loopback fallback candidates', () => {
+  expect(getLocalProviderRetryBaseUrls('http://localhost:11434')).toEqual([
+    'http://localhost:11434/v1',
+    'http://127.0.0.1:11434',
+    'http://127.0.0.1:11434/v1',
+  ])
+})
+
+test('does not derive local retry base URLs for remote providers', () => {
+  expect(getLocalProviderRetryBaseUrls('https://api.openai.com/v1')).toEqual([])
+})
+
+test('enables local toolless retry for likely Ollama endpoints with tools', () => {
+  expect(
+    shouldAttemptLocalToollessRetry({
+      baseUrl: 'http://localhost:11434/v1',
+      hasTools: true,
+    }),
+  ).toBe(true)
+})
+
+test('disables local toolless retry when no tools are present', () => {
+  expect(
+    shouldAttemptLocalToollessRetry({
+      baseUrl: 'http://localhost:11434/v1',
+      hasTools: false,
+    }),
+  ).toBe(false)
+})
+
+test('disables local toolless retry for non-Ollama local endpoints', () => {
+  expect(
+    shouldAttemptLocalToollessRetry({
+      baseUrl: 'http://localhost:1234/v1',
+      hasTools: true,
+    }),
+  ).toBe(false)
+})