Sql guardrails, Improve error handling, fix precision defaults for float attribute

[sagebree]

• SQL guardrails — block statement stacking and writes hidden by comments, string literals, or zero-width prefixes
• DataFrame MultiIndex columns rejected up-front with a flatten hint instead of producing tuple keys that fail deep in the JSON encoder
• records.get() deprecation warning now names both migration paths (retrieve() for single-by-ID and list(filter=...) for filtered queries)
• Server error.innererror.message appended to HttpError.message on both single-request and batch paths, so the offending field/dtype reaches users without inspecting the wire payload
• "float"/"double" shorthand precision default raised from 2 to 5 (max for DoubleAttributeMetadata.Precision) so values like 2.718 round-trip without silent truncation; decimal/money left at 2

[Copilot]

Pull request overview

This PR tightens Dataverse client validation and improves user-facing diagnostics around SQL safety, pandas DataFrame conversion, deprecated record retrieval, and server error messages.

Changes:

• Adds SQL guardrails for stacked statements, comment-hidden writes, string-literal masking, and zero-width-prefixed write keywords.
• Improves error messages for pandas MultiIndex columns and Dataverse innererror.message payloads.
• Updates records.get() deprecation guidance and changes float/double metadata precision defaults from 2 to 5.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/PowerPlatform/Dataverse/utils/_pandas.py	Rejects MultiIndex DataFrame columns before record conversion.
src/PowerPlatform/Dataverse/operations/records.py	Expands records.get() deprecation warning with retrieve/list migration paths.
src/PowerPlatform/Dataverse/data/_odata.py	Appends nested Dataverse inner error details to HttpError messages.
src/PowerPlatform/Dataverse/data/_odata_base.py	Updates float precision default and strengthens SQL guardrails.
src/PowerPlatform/Dataverse/data/_batch_base.py	Appends nested inner error details for top-level batch failures.
tests/unit/test_pandas_helpers.py	Adds MultiIndex rejection coverage.
tests/unit/data/test_sql_guardrails.py	Adds SQL guardrail regression coverage.
tests/unit/data/test_odata_internal.py	Adds inner-error parsing and precision default tests.
tests/unit/data/test_batch_edge_cases.py	Adds batch inner-error parsing coverage.

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