ci(warden): Use Pi runtime for org baseline (#182)

Configure the org-wide Warden baseline to use the Pi runtime with a provider-qualified Anthropic model selector. This matches the current Warden runtime configuration and avoids unresolved model selectors in CI.

Co-authored-by: OpenAI Codex <codex@openai.com>

Author: dcramer

warden.toml

@@ -1,6 +1,8 @@
 version = 1
 
 [defaults]
+runtime = "pi"
+model = "anthropic/claude-sonnet-4-6"
 reportOn = "medium"
 failOn = "off"
 failCheck = false