Loki Mode v7.28.1

Fixed

• HOTFIX: loki grill now works on stock macOS (no GNU coreutils). The
  provider invocation hard-depended on the timeout command, which stock
  macOS does not ship; the command-not-found was swallowed by stderr
  suppression and surfaced as a misleading "provider returned no output".
  grill now uses the same fallback chain as the runner (timeout, then
  gtimeout, then bare execution). Caught by the new grill success-path CI
  test on macos-latest runners: the v7.28.0 Tests workflow ran red on macOS
  and the Release workflow was cancelled mid-publish (npm/tag/GitHub Release
  for 7.28.0 had already gone out; 7.28.1 supersedes it on all channels).
  Verified by repro under a stock-macOS PATH (no timeout/gtimeout): exit 0,
  full report header.

Tests

• tests/test-cli-commands.sh: 23/23 on both routes. scripts/local-ci.sh:
  48 passed, 0 skipped, 0 failed.