n8n_evaluations: add run/cancel actions when n8n releases the trigger/cancel Public API

[czlonkowski]

n8n merged trigger/cancel endpoints for evaluation test runs (n8n-io/n8n#33979, merged 2026-07-14): POST /workflows/{id}/test-runs and POST /workflows/{id}/test-runs/{runId}/cancel, with new API-key scopes testRun:create / testRun:cancel. They are not yet in any released n8n version (absent from 2.30.x and the 2.31.0 pre-release).

When they ship in a stable release, extend n8n_evaluations (added in #935) with run and cancel actions:

• run: POST test-runs, 201 → persisted run. Requires workflow:execute. Error mapping to add: 403 evaluations unlicensed, 402 per-instance "workflows with evaluations" quota exhausted (new workflows only — re-running an already-counted workflow is always allowed), 409 workflow has no evaluation trigger.
• cancel: POST cancel, 202 → { id, status: 'cancelled' }.
• Update tool description/doc (drop "triggering runs via API is not yet supported"), DESTRUCTIVE_TOOL_OPERATIONS (run/cancel are write ops — annotations recompute), and the changelog note in 2.65.0 that promised this follow-up.
• The same n8n release gate applies: keys need re-creation to pick up the new scopes.

Conceived by Romuald Członkowski - www.aiadvisors.pl/en

[czlonkowski]

Status check 2026-07-16: still gated. The merge commit for n8n-io/n8n#33979 (18b34ca, merged 2026-07-14 09:16 UTC) is on n8n master but not contained in any release tag — verified via commit-containment against n8n@2.30.6 (stable), n8n@2.31.1, and n8n@2.31.2 (pre-releases): all diverged. 2.31.0 was cut from master ~1h before the merge, and patch releases only receive cherry-picked fixes, so the endpoints will first appear in 2.32.0 (pre-release expected ~2026-07-21 on the weekly cadence, stable promotion after that). No action possible yet; re-check when a 2.32.x release exists.