fix(cli): stats never hides a failed task behind a cancelled sibling

[aviggiano]

Follow-up to #1200, from Greptile's P1 on #1200.

Problem

stats reports a failed node as canceled when Smithers cancelled every failed task of it (#1087, #1200). workflowCancelled in packages/cli/src/run-statistics.ts used a missing Smithers state as the mark of a fan-out aggregate record. So it also skipped a failed task record without a state. For a fan-out node with one cancelled task and one failed task without a state, it saw only cancelled and reported the node canceled. The failure disappeared from totals.status_counts, which contradicts docs/reference/cli.md ("When Smithers cancelled every failed task of a node").

A triage of the finding found no writer on main, or in past releases, that records a failed task without a state. So this fixes the rule, not an observed run.

Change

• Skip only records that carry aggregate_attempt_statuses (the fan-out aggregate).
• Count any other failed record without a Smithers state as "not cancelled", so the node stays failed.
• The rule now names the aggregate explicitly instead of inferring it from a missing field. The function stays the same size.

Verification

• stats counts a failed node whose task Smithers cancelled as canceled gains the mixed case: a cancelled task plus a failed task without a state. On origin/main it fails with actual: ['canceled', 0, 1], expected: ['failed', 1, 0]. It passes here.
• run-statistics.test.ts: 18/18.
• prettier, eslint, lint:strict:ci and CLI tsc --noEmit pass.

Risk

A failed record without a state or provenance that is not an aggregate now keeps its node failed, as the documentation says. The only records skipped are aggregates, and they always carry aggregate_attempt_statuses (required by the run-state schema).

🤖 Generated with Claude Code

Confidence Score: 5/5

The PR appears safe to merge.

Summary

The PR changes stats to exclude fan-out aggregate records explicitly when deciding whether Smithers canceled every failed task. It adds a mixed canceled/stateless-failure test and documents the correction in the changelog.

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