Add a new cmd_runner Python package and CLI along with supporting modules (kernels, input handling, VT mode, utils) and top-level cmd_runner.py. Include installation scripts (install-lpython.ps1, cmake templates), integration benchmarks, ADID framework and other documentation, .codex/.cursor/.opencode rules and skills, and extensive runtime logs. Also update CMakeLists.txt and README.md to integrate the new tooling. This large import brings the command-runner tooling, docs, tests and diagnostic logs into the repository.

Update dependency, build config, fix ASR iteration bug, and add tests.

- Bump @opencode-ai/plugin from 1.2.10 to 1.2.27 in .opencode/package.json.
- Reduce CMake parallel build jobs from -j8 to -j4 in build1.bat.
- Fix ASR list iteration: use index_plus_one instead of explicit_iter_var when constructing ListItem_t in src/lpython/semantics/python_ast_to_asr.cpp to correct loop element expression generation.
- Add test_for_fix.py with comprehensive iteration tests (list, string, range, nested lists, empty/single lists, stepped and negative-step ranges, and a while loop) to validate iteration behavior.

Fix loop source element creation in python_ast_to_asr: replace ASRUtils::EXPR(index_plus_one) with ASRUtils::EXPR(explicit_iter_var) when constructing a ListItem, ensuring the correct expression is used for explicit iterator variables. Also add test_for_asr.py containing a simple for-loop over a list[i32] to validate for-loop ASR generation.

Remove Semgrep tag indexing references in RAG skill docs (updated .codex/.cursor/.opencode SKILL.md) and note that semgrep_tags_enabled is ignored for performance. Bump @opencode-ai/plugin dependency to 1.3.0 in .opencode/package.json. Advance libasr submodule to the newer commit.