Moved NYASH_JOINIR_STRUCTURE_ONLY environment variable handling
from inline std::env::var() in routing.rs to a centralized helper
function in src/config/env/joinir_flags.rs.
Changes:
- Added joinir_structure_only_enabled() helper function
- Replaced direct env::var() call in routing.rs with helper
- Maintains existing behavior: default ON, NYASH_JOINIR_STRUCTURE_ONLY=0/off to disable
- Follows env module centralization pattern (Box Theory: separation of concerns)
Testing:
- cargo test --lib: 1126 passed ✅
- Regression: Phase 107 VM smoke ✅
- Phase 113/114 maintained ✅🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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