test: cover #20/#21 partition-key UPDATE rejection (no _events leak)

[vyruss]

#21 (hot row cross-tier ts update leaks the internal _events name) has the same root cause as #20 and is already fixed by partition-column block in #23. UPDATE is rejected at parse-analyze before the hot DML that hits PG partition router. Adds CI journey assertions for both directions plus explicit check that _events never appears in the error. Closes #21.

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Reviewing files that changed from the base of the PR and between 4f5f679 and 80890cd.

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