Add dialect config validation with error handling

[benfdking]

Summary

This PR adds comprehensive validation and error handling for dialect configuration options. Dialect initialization functions now return Result<Dialect, String> instead of Option<Dialect>, enabling proper error reporting when configuration values are invalid.

Key Changes

• Dialect config validation: Modified DialectConfig::from_value() to return Result<Self, String> instead of Self, allowing validation errors to be propagated
• Type checking for config values: Added validation that known config keys have boolean-parseable values; returns descriptive errors for type mismatches (e.g., string or integer values for boolean options)
• Unknown config key warnings: Implemented logging warnings for unrecognized configuration keys while still allowing dialect initialization to succeed
• Updated all dialect functions: Changed all dialect(config: Option<&Value>) -> Dialect signatures to dialect(config: Option<&Value>) -> Result<Dialect, String> across all 13 dialect implementations
• Updated kind_to_dialect(): Changed return type from Option<Dialect> to Result<Dialect, String> with descriptive error messages for disabled dialects
• Comprehensive test coverage: Added 5 new tests validating invalid config values, superfluous config keys, and default behavior

Implementation Details

• The dialect_config! macro now generates validation logic that:
  • Checks for unknown keys and logs warnings
  • Validates that known keys have boolean-compatible values
  • Returns errors with the problematic key name and expected type
• All dialect initialization code updated to use .transpose()? pattern for proper error propagation
• Updated all call sites throughout the codebase to handle the new Result return type
• Added log workspace dependency for warning messages

https://claude.ai/code/session_01W8Ldw75CKMAj6dcjM6K3NV

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 2f3beebc92

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[chatgpt-codex-connector]

Handle dialect config errors without panicking

When a dialect option has an invalid type, kind_to_dialect() now returns Err, but FluffConfig::new() immediately calls .expect(...) here, which turns user config mistakes into a process panic. This affects normal entry points like from_file(), from_source(), and from_root(), so a malformed [sqruff:dialect:*] value can crash the CLI/library instead of surfacing a recoverable configuration error.

Useful? React with 👍 / 👎.

[github-actions]

Benchmark for 3331b5c

Click to view benchmark

Test	Base	PR	%
DepthMap::from_parent	52.4±0.92µs	52.7±0.92µs	+0.57%
fix_complex_query	11.9±0.17ms	12.2±0.24ms	+2.52%
fix_superlong	267.4±29.43ms	208.2±10.79ms	-22.14%
parse_complex_query	4.2±0.05µs	4.1±0.06µs	-2.38%
parse_expression_recursion	7.1±0.17µs	7.2±0.11µs	+1.41%
parse_simple_query	1063.1±19.41ns	1063.8±14.18ns	+0.07%