Two live-QA findings from a locked KDE desktop (real cua-driver 0.20.0):
1. capture() with zero discovered windows returned a bare
'capture mode=ax 0x0' — no hint that the desktop session was LOCKED,
which freezes renderers and hides windows. New
_empty_discovery_reason() names the dominant causes in order: locked
session (loginctl LockedHint probe, fail-safe), missing DISPLAY,
else a pointer at hermes computer-use doctor. Surfaced through the
existing window_title -> summary path, so the model and the user see
it inline.
2. _call_tool_via_cli retried 'daemon is not running' 4x with ~3.5s of
backoff sleeps — a permanent condition for that invocation (the CLI
transport needs the machine-wide daemon; Hermes' MCP runtime does
not). Now fails fast on the first attempt with a message naming the
split. Transient empty output (EAGAIN congestion) keeps the retry
loop — pinned by test.
Live-verified on the locked desktop: capture now reports the lock and
the unlock action; CLI fallback errors immediately with the transport
explanation. 7 new tests; 191 sibling tests green.
Teknium