[mday-io]

Description

With query_execution_context: true, SQLMesh now supplies model-batch context
without an application-defined provider. Warehouse SQL and observer callbacks
can use the same operation ID during Context.apply() and built-in scheduler runs.

This PR depends on #6173 and includes
that provider until the parent lands.
The automatic-only comparison
shows the additional changes.

Native observation events create an immutable context with model, snapshot,
operation ID, and available interval and batch index. Nested audits reuse the
batch ID. Callbacks read it through get_query_execution_context().

• Isolate worker context and restore it after completion or cancellation.
• Forward console-observer events once. Automatic context works without a console
  observer; observer_scope(None) disables it explicitly.
• Exclude observer-callback SQL from automatic model context. Custom providers
  remain authoritative, including when they return None.

A supported, enabled warehouse adapter without a custom provider activates the
observer. State-only opt-in does not. Coverage is model batches and nested audits,
with broad phases. Standalone operations and detailed per-statement roles are
outside this scope.

Test Plan

Style and fast tests were rerun after inheriting the test-only DuckLake cache fix.
Earlier checks remain applicable because the automatic-only patch is unchanged.

• Local make style and all six make fast-test phases passed. 2,999 passed,
  13 skipped.
• Earlier 71 observer, transport, and integration checks passed, including
  audit-only batches, malformed facts, restoration, disablement, and custom providers.
• Earlier CLI init/DLT tests, doctests, and runnable example passed. Native
  plan/apply/run checks matched batch and audit IDs across provider, automatic,
  and default-console modes. Rows, hashes, snapshots, and intervals matched;
  default state SQL had no context.
• Windows CI
  passed with DuckDB 1.5.6 after the previous extension-install failure. The
  inherited worker-cache fix passed all four DuckLake adapter cases.
• Remaining CI on the revised head.
• 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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