# Replace unwrap() with expect() for Unreachable Code Paths

## Task Summary
Replaced all unreachable `.unwrap()` calls with `.expect()` and descriptive error messages in source files to eliminate unnecessary coverage gaps while maintaining code clarity.

## Status: Completed

## Changes Made

### src/parameters.rs (14 replacements)
- 4 regex lazy statics with compile-time valid patterns:
  - `PARAMETER_REGEX`
  - `TABLE_NAME_REGEX`  
  - `LIST_PARAMETER_REGEX`
  - `COMMA_LIST_REGEX`
- 1 regex capture group extraction in `extract_parameters_with_regex`
- 1 transaction keywords regex in `contains_transaction_keywords`
- 2 number conversions in `json_value_to_parameter_value_inferred`:
  - `as_i64()` after `is_i64()` check
  - `as_f64()` for non-i64 numbers
- 1 JSON serialization in `json_value_to_parameter_value_inferred` (always valid for serde_json::Value)
- 6 parameter handling in `prepare_parameter_statement_generic`:
  - Table name value get and as_str
  - List value get and as_array
  - Comma list value get, as_array, and item as_str

### src/parameter_constraints.rs (6 replacements)
- 2 `as_f64()` calls for validated numeric types in range validation
- 2 `as_array()` calls for validated array types (List and CommaList validation)
- 1 `as_str()` call for validated string in CommaList items
- 1 `as_str()` call for validated TableName type

### src/query/query_def.rs (1 replacement)
- 1 `args.get()` call guaranteed by augmented args creation in `process_regular_parameter`

### src/query/query_definitions.rs (2 replacements)
- 2 regex capture group extractions in `from_json` for dynamic returns parsing

## Total: 23 replacements

## Verification
- All tests pass (run-local-tests.sh)
- clippy and fmt run successfully with no warnings
