feat: support claude-code setup and status

docs-site/content/docs/getting-started/quickstart.mdx

@@ -59,12 +59,13 @@ completed setup steps and resumes from the remaining work.
 KTX uses a Claude model for ingest agents that turn schemas, SQL, BI metadata,
 and documents into semantic-layer sources and wiki context.
 
-Setup supports two LLM provider paths:
+Setup supports three LLM provider paths:
 
 | Provider | Use when | Credential model |
 |----------|----------|------------------|
 | Anthropic API | You have an Anthropic API key | `ANTHROPIC_API_KEY` or a local `file:` secret |
 | Google Vertex AI for Anthropic Claude | Your organization runs Claude through Google Cloud | Application Default Credentials plus Vertex project and location |
+| Claude Code | You want KTX to use your local Claude Code session | Claude Code local authentication |
 
 For Anthropic API, setup can read the key from the environment or save a pasted
 key to `.ktx/secrets/anthropic-api-key`. `ktx.yaml` stores an `env:` or `file:`
@@ -74,6 +75,25 @@ For Vertex AI, setup uses Google Application Default Credentials. It can read
 your active `gcloud` project, list visible projects, or accept explicit
 `--vertex-project` and `--vertex-location` values.
 
+To use your local Claude Code session instead of an API key, set:
+
+```yaml
+llm:
+  provider:
+    backend: claude-code
+  models:
+    default: sonnet
+    triage: haiku
+    candidateExtraction: sonnet
+    curator: sonnet
+    reconcile: sonnet
+    repair: sonnet
+```
+
+`claude-code` uses the Claude Code authentication already configured on your
+machine. It doesn't use `ANTHROPIC_API_KEY`, Vertex credentials, AI Gateway
+tokens, or Bedrock credentials.
+
 Setup checks the selected model before saving. Anthropic API setup fetches live
 Claude model choices when possible and falls back to bundled defaults if model
 discovery is unavailable.