PR #65716: fix(anthropic-vertex): resolve model discovery and auth for GCP ADC

• Repository: openclaw/openclaw
• Author: feiskyer
• State: open | merged: False
• Link: https://github.com/openclaw/openclaw/pull/65716

Description (problem / solution / changelog)

Fixes #65715

Regression introduced in f0ea5bf393 ("plugins: add lightweight anthropic vertex discovery"), which added a provider discovery fast-path for anthropic-vertex. Three issues in that change prevented models from being discovered and authenticated when using GCP Application Default Credentials:

1. .ts → .js fallback in manifest-registry: The plugin manifest references providerDiscoveryEntry: "./provider-discovery.ts", but dist builds only emit .js. The jiti source loader fails to find the .ts file, and the catch { return []; } swallows the error silently — so the entire provider discovery returns empty. Add a fallback in resolvePluginSourcePath so the source loader finds the compiled file.

2. Remove env !== process.env identity guard: resolveAnthropicVertexAdcCredentialsPathCandidate skips the default ADC file check when the env object is not the exact process.env reference. The config runtime creates a spread copy ({ ...process.env, ...configEnvVars }), so this identity check always fails, causing catalog.run() to return null even when ADC credentials exist on disk. Remove the guard.

3. Add resolveSyntheticAuth hook: The discovery entry and plugin registration lack resolveSyntheticAuth, so credential discovery (resolvePiCredentialsForDiscovery) never recognizes gcp-vertex-credentials as valid auth. Add the hook to both the discovery entry and the plugin index.

Also adds augmentModelCatalog to the plugin registration and isSyntheticCredentialMarker to model-auth-markers so resolveUsableCustomProviderApiKey treats synthetic credential markers as usable.

Testing

• All existing anthropic-vertex tests pass (12 tests across 4 files)
• Added 2 new tests for resolveSyntheticAuth (ADC present / absent)
• Verified locally: openclaw models list shows text+image, 1M ctx, Auth: yes for anthropic-vertex models after the fix

Changed files

• extensions/anthropic-vertex/index.test.ts (modified, +52/-1)
• extensions/anthropic-vertex/index.ts (modified, +18/-0)
• extensions/anthropic-vertex/provider-discovery.ts (modified, +15/-3)
• extensions/anthropic-vertex/region.ts (modified, +0/-3)
• src/plugins/manifest-registry.ts (modified, +21/-1)