* fix(linear): guard mixed-version RPC filtering
* fix(linear): surface filter capability failures correctly
Prevent capability checks from pinning to rejected compatibility cache
entries, and rethrow typed attribute-filter unsupported errors from the
Linear store so TaskPage can show an upgrade message instead of an empty
filtered list.
* fix(runtime): refresh cached capability verdicts
* test(linear): mock isLinearIssueAttributeFilterUnsupportedError
Prevents the invalidation slice test from failing after the runtime
client gained this export, which was otherwise undefined in the mock.
* Fix cold-cache capability probes firing duplicate status.get calls
Coalesce concurrent status.get requests for the same environment by
publishing the in-flight probe to the compatibility cache before
awaiting it, so parallel capability checks share one RPC call. On
failure, drop the cache entry immediately since this probe always
re-fetches and must not leave a stale cached verdict.
Jinjing
60c26af8b8