Fixes from 77/77 thorough test:
- SOFTSEEK uses CurRecNo() (was requiring recNo>0)
- SEEK reads SET SOFTSEEK at runtime (was compile-time only)
- SkipIndexed skips deleted records when SET DELETED ON
- GoTopIndexed skips deleted at top position
- evalKeyExprInner TrimSpace on fieldName (compound key fix)
- SET INDEX TO uses exprToString (was emitExpr treating as variable)
- hasXBaseCommands scans nested blocks (BEGIN SEQUENCE, IF, FOR, etc.)
77/77 thorough test PASS. Stress test (82 items) in progress.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
