refactor(smokes): Task 5 - Environment variable SSOT centralization
Create single source of truth for smoke test environment configuration:
**tools/smokes/v2/lib/env.sh** (new, 183 lines):
- Centralize 16 environment variables across 6 categories
- JoinIR development (NYASH_JOINIR_DEV, HAKO_JOINIR_STRICT)
- LLVM features (NYASH_LLVM_USE_HARNESS, NYASH_LLVM_BACKEND, etc.)
- Tmpdir EXDEV mitigation (TARGET_TMPDIR)
- Plugin loader strategy (NYASH_LOAD_NY_PLUGINS, NYASH_DISABLE_PLUGINS)
- Parser features (NYASH_FEATURES, using system variables)
- Debug features (NYASH_CLI_VERBOSE, etc.)
**Mode Presets**:
- dev: Verbose logging, unlimited fuel, JoinIR dev enabled
- integration: Moderate settings, JoinIR dev enabled
- quick: Minimal logging, fast execution
**Helper Functions**:
- setup_smoke_env [mode]: Configure environment for test profiles
- validate_env_setup: Validate configuration
- show_smoke_env: Display current configuration
**Documentation**:
- ENV_README.md: Comprehensive usage guide
- ENV_QUICK_START.md: Quick reference for script authors
- p1.5-task5-env-ssot.md: Implementation details and testing
Benefits:
- SSOT: Single file for all environment variables
- Sparrow prevention: No duplicate settings
- Clarity: Well-documented configuration
- Backward compatibility: Existing scripts work unchanged
Test Results:
- All environment presets work correctly
- Phase 131 smoke tests PASS
- Syntax validation for all shell files PASS
Related: Phase 131 smoke test infrastructure improvement
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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