[mday-io]

Description

SQLMesh's plan and run markers identify the parent job in warehouse query history,
but not the model evaluation behind each statement. This PR adds an opt-in
provider so applications can use the same evaluation ID in SQL and observer records.

Enable query_execution_context on a connection and supply an adapter provider
that returns an immutable QueryExecutionContext. SQLMesh appends version-one
JSON after the existing correlation marker, once SQL is rendered.

• Escape comment delimiters and bound the comment to 8,192 UTF-8 bytes. Provider
  or serialization errors omit optional context and let the query continue.
• Preserve settings across adapter clones, isolate cached DuckDB settings, and
  exclude the default state adapter.
• Roll back adapter-owned transactions on provider or driver cancellation, then
  propagate the original BaseException.

The flag defaults to false. Without a provider, enabled adapters can emit
parent-only context. Athena and other adapters without generic comment support
skip this transport. A runnable DuckDB example connects context to observer events.
#6174 adds automatic model context.

Test Plan

The DuckLake extension-cache repair moved to #6193 and is excluded from this PR.

Local style and fast tests passed on the revised head. Earlier feature
checks remain applicable because all other file contents are unchanged.

• Local make style and all six make fast-test phases passed. 2,983 passed,
  13 skipped, with automatic workers limited to two.
• The restored DuckDB adapter module passed all 15 tests serially.
• Earlier serializer, adapter, configuration, and cancellation checks passed,
  including real SQLite rollback and later transaction reuse.
• Earlier CLI init/DLT tests, doctests, and runnable example passed. Native
  plan/apply/run checks matched observer and SQL IDs across six batches and audits.
  Rows and hashes were unchanged; default state SQL had no rich context.
• GitHub CI on the revised head. The DuckLake repair in fix(tests): isolate DuckLake extension caches per worker #6193 may
  need to land before Windows CI passes.
• Strict local MkDocs build and remote warehouse qualification. MkDocs is
  unavailable locally; remote warehouses were not exercised locally.

Checklist

• I have run make style and fixed any issues
• I have added tests for my changes (if applicable)
• All existing tests pass (make fast-test)
• My commits are signed off (git commit -s) per the DCO

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