fix(dag): crash recovery completes schemaless running nodes with undefined — replan verdict vanishes after restart

[LeXwDeX]

Source: docs/audit-dag-deepdive-2026-08-19.md (DAG-06, Medium)

Mechanism

recovery.ts:92-106: when a recovered running node's child session is completed but NodeCompleted was never published (crash window: final reply persisted, event not), the recovery path completes schemaless nodes with nodeCompleted(dagID, node.id, undefined) and never reads the child session's messages. Live path (spawn.ts:483-521) takes the last text part.

Consequences:

• a schemaless checkpoint that replied with raw string {"verdict":"replan"} loses its veto after recovery (loop.ts:699-704 reads node.output === undefined) — no pause, no warning
• gated dependents' .output.<field> resolves undefined → condition_false skip
• downstream input_mapping degrades to placeholder

Reachable: the runtime replan seam explicitly exempts the schema obligation (requireOutputSchema:false) and DAG-05's httpapi start bypasses authoring entirely, so schemaless reporting nodes remain legal. Degenerate branch: unparseable wf.config makes schema-carrying nodes fall into the same else (undefined) branch, bypassing settleCapturedOutput.

Acceptance

• recovery reads the child session's last assistant text part (symmetric with live path)
• unparseable config treated as schema-present (fail, not undefined-complete)
• regression test: crash after child produced a string verdict → recovery preserves the veto

[LeXwDeX]

Delivered via PR #362 (merged to dev); recovery mirrors the live path's text settlement for schemaless nodes and fails loudly on unparseable rows; specgit finish exit 0.