test(wren-core): add tests for analyze_with_url_tables and dequote_identifier

[goldmedal]

Summary

• Add 3 tests for analyze_with_url_tables: rejects non-file data sources, accepts omitted data source, and succeeds with LocalFile + real Parquet file
• Add test_dequote_identifier covering edge cases: quoted/unquoted strings, empty string, single " (len < 2 panic guard), quoted URLs, partial quotes

Test plan

• All 4 new tests pass locally
• Full test suite (78 tests) passes
• cargo clippy --all-targets --all-features -- -D warnings clean

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