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Adds an optional `continue_on_error: bool` field on every step.
When set to `true` and the step fails, the engine records the
result (`exit_code`, `stderr` on `steps.<id>.output` plus `status`
as a sibling key on `steps.<id>`) and continues to the next sibling
step instead of halting the run. Downstream `if`, `switch`, or
`gate` steps can then branch on
`{{ steps.<id>.output.exit_code }}` to route the recovery path.
Engine details
--------------
`WorkflowEngine._execute_steps` now consults the step config when a
step returns `StepStatus.FAILED`:
- Gate aborts (`output.aborted`) always halt the run — operator
decisions take precedence over the flag.
- Otherwise, if `continue_on_error` is the literal `True`, log a
`step_continue_on_error` event and proceed to the next sibling.
The runtime check uses identity comparison (`is True`) rather
than truthiness, so truthy non-bool values like the string
`"true"` cannot silently change run semantics even if a caller
bypasses `validate_workflow()`.
- Otherwise, behave as before: log `step_failed`, set
`RunStatus.FAILED`, and return.
Validation
----------
`_validate_steps` rejects non-bool values for `continue_on_error`.
Coerced strings like `"true"` are not accepted so authoring
mistakes surface at validation time rather than silently changing
run semantics.
Tests
-----
`TestContinueOnError` in `tests/test_workflows.py` (8 tests):
- `test_undeclared_failure_halts_run` — default halt behaviour.
- `test_declared_and_fired_continues_run` — flag + fail → continue.
- `test_declared_but_step_succeeded_is_noop` — flag + success → no-op.
- `test_if_branch_routes_around_failure` — end-to-end recovery.
- `test_gate_abort_still_halts_with_continue_on_error` — abort
always halts.
- `test_validation_rejects_non_bool_continue_on_error` — `"true"`
rejected at validation.
- `test_validation_accepts_bool_continue_on_error` — `true`/`false`
pass cleanly.
- `test_engine_ignores_truthy_non_bool_continue_on_error` —
defense-in-depth: engine ignores string `"true"` even when
validation is bypassed.
Rebased onto current upstream/main (post #2664 merge); the new
`TestContinueOnError` class sits immediately after upstream's
`TestContextRunId` so the two feature suites coexist cleanly.
Closes #2591.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>