* Refactor result_stdout_raw_handle to use parameterized COPY SQL.
Replace f-string SQL construction with psycopg.sql composables and bound
parameters so security scans no longer flag formatted raw SQL in the
unified jobs stdout path.
Fix sqlite_copy mock rendering for psycopg3 SQL composables.
* Fix sqlite_copy mock without psycopg SQL internals.
Load stdout from the first populated event table instead of rendering
psycopg composables, which use version-specific private attributes.
* Use sql.Literal in COPY query for Django cursor.copy compatibility.
Django's cursor.copy() does not forward bind parameters to psycopg,
which caused stdout API 500s against real PostgreSQL.
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