createFnAgent now delegates to createResolvedAgentSession — deriving the CLI
runtime hint (cursor/claude/grok/omp/hermes), mock/test-mode forcing, and
session:runtime-resolved visibility — using a host-registered default
PluginRunner keyed by project root (published by InProcessRuntime at plugin
init). DefaultPiRuntime re-enters via a __rawPiSession marker so the seam's
own pi bridge cannot recurse, and the raw constructor survives as
createPiAgentSessionRaw for that bridge and pi-internal tests.
Mission and milestone/slice interviews additionally pass their request-scoped
pluginRunner through the seam and prompt via the engine promptWithFallback
dispatcher (plugin CLI runtime sessions have no session.prompt()). This fixes
"Configured model cursor-cli/auto ... was not found in the pi model registry"
in mission planning while chat on the same model worked, and closes the same
gap for every remaining bare createFnAgent lane.
Also updates the pi skill-filtering test that still asserted pre-FN-9114
allow-list narrowing; requested skill names are ensure-present since FN-9114.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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