The File Activity card's hover-underline + click-to-open affordance died
with the harness connection refactor: the hostDescription.canOpenPath
fact and the connection.api.host.openPath RPC that the capability probe
and opener read no longer exist on any supported harness line, so the
probe answered false everywhere and every file name rendered inert.
Re-point both at the session controller's workspace-opener remotes
(session/canOpenWorkspacePath / session/openWorkspacePath) over the
generic '/api' channel — the same Connection RPC the split timeline's
detail channel rides — with the wire contract proved against a live
host: `args` must be a plain object keyed by the remote's declared
parameter names (an array is rejected host-side), and the capability is
now an RPC round-trip instead of a synchronous host fact, so it lands
in view state behind the harness's own isLoopback gate; a probe that
settles after unmount drops its answer. The shared connection-RPC
resolution is deduped into rpcCallOf, which makeDetailFetcher reuses.
Bowen Liang
2d371dc72c