fix(batch): preserve typed error recovery signals - #1761

Reviewed exact head 6cc05f7. Using the canonical DaemonError shape and conditionally copying retriable/supportedOn fixes the real batch-wrapper truncation while keeping unknown signals absent. The production route remains compatible with generic request finalization, the regression is non-vacuous, touched-file topology is healthy, and this pure wire-composition fix does not require device evidence. No source issue remains.

This is not readiness-ready yet: the PR body is still the untouched template. Please document the motivating recovery-signal loss, concise summary, validation with red-before evidence, and the two-file scope. GitHub also reports zero checks for this exact head, so it cannot yet be called CI-green. Keep draft until the body and authoritative checks are complete.

No ready-for-human label applied.

Readiness update for unchanged exact head 6cc05f72: the title, substantive body, and draft-state blockers are resolved. The reviewed change remains code-clean and ready for human review; no device evidence is needed for this pure error-wire composition fix.

The only material blocker is owner approval and completion of full authoritative CI: GitHub still reports zero checks. Please also finish the body evidence with explicit two-file scope accounting and the actual red-before result, rather than only stating that coverage was added.