Base branch: claude/implement-get-actor-run-MUTXI (or master once merged).

Sub-issue of #582. No behavior change.

Context

#582 wants call-actor to return immediately and get-actor-run to gain waitSecs. Both feature handlers will share helpers that today live inline in actor_execution.ts:callActorGetDataset (the abort-race) and aren't yet factored out for use by the always-async path. Land the extraction first so the feature PR is a small, readable diff.

Scope

Pure mechanical extraction. No public schema change.

• src/tools/core/call_actor_common.ts:
  • Extract waitForRunWithAbort({ runId, apifyClient, abortSignal }) from the inline Promise.race against CLIENT_ABORT in src/tools/core/actor_execution.ts:callActorGetDataset (~lines 80-130). On abort, call apifyClient.run(runId).abort({ gracefully: false }) and return null. Caller decides what to return on null.
  • Add buildActorRunStructuredContent({ run, actorName }) returning { runId, actorName?, status, startedAt, finishedAt?, stats?, storages, hint } — uniform shape consumed by both call-actor and get-actor-run. No inline preview, no input echo.
  • Add getRunStatusHint(status) — maps statuses to the strings finalized in #C.
• src/const.ts: add ACTOR_RUN_STATUS const object mirroring ACTOR_JOB_STATUSES from @apify/consts. Used by getRunStatusHint.
• src/tools/structured_output_schemas.ts: add actorRunOutputSchema (uniform shape; actorName, finishedAt, stats optional). Existing callActorOutputSchema, buildEnrichedCallActorOutputSchema, and getActorRunOutputSchema stay untouched — repointed in #C.
• src/types.ts: add mcpTaskExecution?: boolean to InternalToolArgs. Unused in this PR.
• src/tools/core/actor_execution.ts:callActorGetDataset: replace the inline abort race with a call to the new waitForRunWithAbort. Behavior identical.

Plan

• Extract waitForRunWithAbort; swap callActorGetDataset to use it
• Add buildActorRunStructuredContent + getRunStatusHint
• Add ACTOR_RUN_STATUS and actorRunOutputSchema
• Add mcpTaskExecution? to InternalToolArgs
• Unit tests for the new helpers

Files touched

• src/const.ts
• src/types.ts
• src/tools/core/call_actor_common.ts
• src/tools/core/actor_execution.ts
• src/tools/structured_output_schemas.ts
• tests/unit/...

Acceptance

• npm run type-check, npm run lint, npm run test:unit clean
• No public tool input or output schema change
• Existing integration suite passes unchanged
• mcpc smoke after npm run build: tools-call get-actor-run runId:=<existing> returns the same shape pre/post; tools-call call-actor actor:="apify/python-example" input:='{"first_number":1,"second_number":2}' still completes end-to-end
• apify-mcp-server-internal unaffected (no exported surface change)

Independence

Blocks #C (feat). Independent of #B (cancel fix).

Estimate

~2 h.