Refactor AST to Enum-based & Implement OpenACC 3.4 'indirect' Clause

.gemini/config.yaml

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+have_fun: false
+code_review:
+  disable: false
+  comment_severity_threshold: 'HIGH'
+  max_review_comments: -1
+  pull_request_opened:
+    help: false
+    summary: false
+    code_review: false
+ignore_patterns: []

AGENTS.md

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+# Repository Agent Instructions
+
+- Always consult the latest OpenACC 3.4 specification when updating or extending the parser to ensure semantic accuracy.
+- Preserve LLVM coding style across all source files, including C, C++, ANTLR .g4 sources.
+- To run the regression tests via CMake/CTest:
+  1. Ensure ANTLR4 is installed and visible to CMake (e.g., `which antlr4` should succeed).
+  2. Configure the build directory: `cmake -S . -B build -DCMAKE_BUILD_TYPE=Debug`.
+  3. From the `build` directory invoke `ctest --output-on-failure`.

CLAUDE.md

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+For full project context and agent instructions, please read [AGENTS.md](AGENTS.md).

GEMINI.md

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+For full project context and agent instructions, please read [AGENTS.md](AGENTS.md).