* feat(computer): send tree diffs after actions and add get-app-state --query
Action results now carry only the accessibility-tree lines that changed since
the caller's last view of the same window (~ changed, + added, - removed as
index ranges, or an explicit no-change line), plus the focused element. The
runtime sidecar keeps the last tree per session/worktree and app, so all three
providers get it. The CLI opts in with treeDiff; older runtimes strip the
param and keep returning the full tree, and --full-tree opts out.
The macOS helper now keeps an element's index across snapshots of a window:
AX identity first, then the next unclaimed index with the same signature for
views that rebuild their AX objects, and never reuses a removed index.
get-app-state --query prints matching elements with their ancestors and
--max-elements caps the output, both in the CLI over the rendered tree.
Custom action names with raw newlines no longer split an element over lines.
* fix(computer): preserve parent changes in snapshot diffs
* fix(computer): refuse stale index reuse for lookalike controls
* fix(computer): print full trees in action replies
* fix(computer): keep controls located in snapshot replies
