Release v0.14.0

Added

• Enhanced association safety with bounds checking to prevent IndexError (#133, #195)
• Association foreign key validation in changesets (#249, #195)
• Comprehensive test suite for association safety
• Transaction support with savepoints for nested operations (#249)
• Enhanced changeset validation with association support

Fixed

• IndexError in belongs_to associations (#133, #195)
• IndexError in has_many associations (#133, #195)
• IndexError in has_one associations (#133, #195)
• Query string interpolation corruption (#217)
• Multi-transaction association operations (#249)
• Association foreign key validation (#249, #195)

Improved

• Query and transaction testing coverage
• Live transaction enhancements for better consistency
• Safe array access patterns to all association macros