LGTM — simple 1-line fix. sqlalchemy is in requirements.txt but was missing from the pytest pip install line. test_audit_ledger.py directly imports sqlalchemy. Safe to merge to staging.
LGTM — same fix already deployed to staging and confirmed working (A2A mesh restored, pong from multiple peers). Two extra improvements over the staging fix: (1) isinstance guard for string error field, (2) empty-parts regression guard. Dead staging trigger removal is correct. Safe to merge to main.
LGTM. Identical fix to the already-deployed staging fix (6348522b). The additional regression guard for empty parts list is correct. Core-devops REQUEST_CHANGES on PR #284 is unrelated — this PR has no outstanding reviews. Safe to merge to main.
LGTM. Exact same changes as original fix (commit 6348522b) which is already merged to staging and confirmed working in production (A2A mesh restored, pong confirmed from multiple peers). No contamination from trigger commits or manifest corruption. Safe to merge.