feat: consolidate Epic 8.1 completion and fortfront analysis

Epic 8.1 HLFIR Operation Foundation - COMPLETED:
✅ Created comprehensive RED tests for all HLFIR operations
✅ Analyzed fortfront AST capabilities and limitations
✅ Created 10 GitHub issues (#21-#32) for required enhancements
✅ Established complete TDD workflow for HLFIR implementation
✅ Infrastructure validated - all test harnesses working

BLOCKED: fortfront Issue #32 - need node accessor functions
NEXT SESSION: Implement GREEN phase once fortfront access restored

fortfront Issues Created:
- #21: Disambiguate array indexing from function calls
- #22: Add explicit array section/slice nodes
- #23: Add ASSOCIATE construct support
- #24: Add component access nodes for % operator
- #25: Add character substring nodes
- #26: Add expression temporary tracking
- #27: Add allocatable/pointer attribute propagation
- #28: Add bounds information to array operations
- #29: Add WHERE/FORALL detailed representation
- #30: Add intrinsic function identification
- #32: Restore node accessor functions (BLOCKING)

Ready to proceed with HLFIR implementation once AST access restored.

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: krystophny