Idea: re-run only the failing journey step or spec in a fix loop #492

Split out of #476 (2026-10-20). This applies to any project, whatever mxcli build it uses.

When an acceptance or journey run fails on one step, the fix loop re-runs the whole Playwright script or the whole journey file. On a long journey, most of each fix round is spent replaying steps that already passed.

Idea: a way to re-run only from the failing step or spec. Two possible forms:

• journey-runner.js --from <step>, with a declared state precondition so the earlier steps can be skipped;
• or Playwright's own --last-failed and test filters, used per spec.

Constraints:

• The full journey still runs at the moments the test strategy names (module done, build complete, before deploy), so the shortcut only applies inside a fix loop.
• A step that depends on earlier state must declare it (requires / leaves, which already exist), or the rerun refuses.

Value: shorter fix rounds in the UI loop. Cost: M. Context cost: none, script-side only.

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