SQLite failures hide actionable error details #36578

Description

When a session database write fails, the assistant error can be reduced to:

Failed to execute statement

The nested SQLite result is lost through the SQL/Drizzle error wrappers. In an observed failure, the retained internal cause was SQLiteError: database or disk is full, but the session UI and process error did not expose that actionable detail.

Expected behavior

Surface a sanitized SQLite result, for example:

Failed to execute statement: database or disk is full

Do not include SQL query parameters or arbitrary native messages, because SQLite diagnostics can echo bound values.

Additional context

The observed database passed PRAGMA quick_check and resumed writing after the transient failure. The filesystem was under high utilization, supporting SQLITE_FULL rather than corruption.