Vikunja #268 (P0): handleHexisAct swallowed genuine Nexus resolve errors
and Hexis capability-discovery errors into "" or an empty capability list,
which fell through to the local system command executor — a dependency
outage silently looked identical to "not an ecosystem entity" or "no
capabilities registered", violating the spec's degrade-independently /
never-silent-all-clear invariant.
- resolveEntityReference's error is now distinguished from a legitimate
not_found: only the latter falls through.
- discoverCapabilities now returns (caps, err) instead of collapsing a
Hexis failure into an empty slice; a real error stops the action with
a degraded-mode spoken reply instead of reaching h.tools.Exec.
- nexusResolveResult gains a custom UnmarshalJSON to accept the flat
entity_id/entity_type/display_name shape from ECOSYSTEM-SPEC.md §1.5
(Nexus now emits both shapes; Maven now reads both).
- Added regression tests: flat-shape resolve, Nexus error fails closed,
Hexis error fails closed, not_found still falls through to local exec.
kami
d9fa4d6613