🚀 feat: Multiple improvements for Nyash parser and LLVM backend

Parser improvements:
- Added expression statement fallback in parse_statement() for flexible syntax
- Fixed ternary operator to use PeekExpr instead of If AST (better lowering)
- Added peek_token() check to avoid ?/?: operator conflicts

LLVM Python improvements:
- Added optional ESC_JSON_FIX environment flag for string concatenation
- Improved PHI generation with better default handling
- Enhanced substring tracking for esc_json pattern

Documentation updates:
- Updated language guide with peek expression examples
- Added box theory diagrams to Phase 15 planning
- Clarified peek vs when syntax differences

These changes enable cleaner parser implementation for self-hosting,
especially for handling digit conversion with peek expressions instead
of 19-line if-else chains.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

docs/reference/architecture/TECHNICAL_ARCHITECTURE_2025.md

@@ -0,0 +1,12 @@
+# Technical Architecture (2025) – Map
+
+This index points to the currently maintained architectural documents:
+
+- Core Concepts: reference/architecture/nyash_core_concepts.md
+- Execution Backends: reference/architecture/execution-backends.md
+- Lowering Contexts: LOWERING_CONTEXTS.md
+- LLVM Layer Overview: LLVM_LAYER_OVERVIEW.md
+- VM Overview: VM_README.md
+- Cranelift AOT design: backend-cranelift-aot-design.md
+
+Note: Some long-form papers reside under `private/papers/reference/architecture/`.

docs/reference/architecture/execution-backends.md

@@ -0,0 +1,8 @@
+# Execution Backends – Index
+
+For the full guide, see:
+- execution-backends.md (legacy location kept up to date)
+
+Additional references:
+- backend-llvm-implementation-guide.md
+- VM_README.md

docs/reference/architecture/nyash_core_concepts.md

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+# Nyash Core Concepts (Index)
+
+Authoritative content is available at:
+- private/papers/reference/architecture/nyash_core_concepts.md
+
+Use this page as a stable reference path under `docs/reference/architecture/`.