fix(bench): preserve workflow receipt failures

[DecisionNerd]

A public-command workflow could report success after a child exited zero with an invalid JSON receipt: the child execution carried EvidenceInvalid, but workflow aggregation checked only the exit code and continued. Stop on either a nonzero exit or a recorded execution failure, preserving the original exit code, failure classification, prior receipts, cleanup details, timing, and RSS.

A real child-process regression proves valid zero-exit receipt sequences succeed, while an invalid second receipt stops the workflow after exactly two commands and retains only the preceding valid receipt. It failed before the fix (None instead of EvidenceInvalid) and passes afterward. Existing nonzero-exit handling remains covered.

Validation:

• All 25 certifier tests passed; all-targets certifier Clippy with -D warnings passed.
• Fresh CLI/certifier/generator binaries completed the real ten-phase tiny lifecycle, retaining 2 recount, 2 query, and 4 reopened-query receipts with matching source/imported results.
• Fast checks, 14 gate-registry tests, and final formatting/diff checks passed.

This is the independent gate defect blocking #1119/#1124. Updating the new adjacency-probe receipt field remains in #1124; this change does not relax receipt validation or resource thresholds.

Closes #1125. Exact-head CI run 33950728612 passed at 78f76ee3bb28d02aae82b6c8829a3d9f2b7f5a88, with successful CI Gate, CLEAN merge state, and no unresolved review threads. Squash merged as 6a937da07a6ee9eb5ae5b2b4247f7432a5e7211a; issue #1125 is closed.

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