migration-script-runner / msr-core / 0d80f79e-79b5-42f4-825b-ecea75a73f48

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#76: Add configurable transaction management for migrations

Implemented comprehensive transaction management system with three modes:
- PER_MIGRATION: Each migration in its own transaction (default, safest)
- PER_BATCH: All migrations in single transaction (all-or-nothing)
- NONE: No automatic transactions (maximum flexibility)

Features:
- SQL support via ITransactionalDB with DefaultTransactionManager
- NoSQL support via ICallbackTransactionalDB with CallbackTransactionManager
- Retry logic with exponential backoff for deadlocks/serialization errors
- Configurable isolation levels, timeout, and retry parameters
- Environment variable configuration (MSR_TRANSACTION_* vars)
- Seamless integration with all rollback strategies

Documentation:
- Complete user guide (37KB) with examples for SQL and NoSQL databases
- Configuration reference and API documentation
- Added comprehensive features page listing all MSR capabilities

Testing:
- 919 tests passing with 100% coverage (987/987 branches)
- Full test coverage for both transaction managers
- Integration tests with rollback strategies

Bug fixes:
- Fixed negative duration display in ASCII and JSON renderers
- Refactored environment variable handling into separate modules

987 of 987 branches covered (100.0%)

Branch coverage included in aggregate %.

1834 of 1834 relevant lines covered (100.0%)

331.69 hits per line