docs(skills): register skills-maintenance and clarify check-cpp-warnings execution

Author: barhanc

.agents/skills/README.md

@@ -9,3 +9,4 @@ This directory contains specialized skills (recipes) to guide contributors and A
 - [Add Task Pipeline](./add-task-pipeline/SKILL.md) — TypeScript task pipelines and React hooks.
 - [Model Schema Validation](./model-schema-validation/SKILL.md) — SymbolicTensor schemas and validation.
 - [Verify and Build](./verify-and-build/SKILL.md) — TypeScript typechecking, native rebuilding, and troubleshooting.
+- [Skills Maintenance](./skills-maintenance/SKILL.md) — Keeping skills synchronized with core primitives.

.agents/skills/core-guidelines/SKILL.md

@@ -73,6 +73,7 @@ Use the following index to locate the specific procedural guides for your task:
 | **Create a task pipeline or hook**           | [SKILL.md](../add-task-pipeline/SKILL.md)       | Guide to building end-to-end TS pipelines (e.g. object detection) and exposing them via React hooks.           |
 | **Verify, rebuild, or troubleshoot changes** | [SKILL.md](../verify-and-build/SKILL.md)        | Workflows for rebuilding TS/C++ and resolving common JSI runtime errors.                                       |
 | **Validate model constraints & schemas**     | [SKILL.md](../model-schema-validation/SKILL.md) | Guide on specifying SymbolicTensor constraints and shapes for model signature validation.                      |
+| **Maintain or refactor codebase patterns**   | [SKILL.md](../skills-maintenance/SKILL.md)      | Guide to keeping workspace skills in sync with codebase state to prevent documentation decay.                  |
 
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.agents/skills/verify-and-build/SKILL.md

@@ -82,7 +82,7 @@ CLANG_TIDY=$(brew --prefix llvm)/bin/clang-tidy yarn workspace react-native-exec
 
 ### 2. `check-cpp-warnings.sh` — clangd warning set
 
-Compiles staged (or explicitly passed) `cpp/` sources with the same flags clangd uses in the editor (from `compile_flags.txt` + `-W` flags in `.clangd`), so the editor and CI stay in sync.
+Compiles staged (or explicitly passed) `cpp/` sources with the same flags clangd uses in the editor (from `compile_flags.txt` + `-W` flags in `.clangd`), so the editor and CI stay in sync. Run from the package root (`packages/react-native-executorch/`):
 
 ```bash
 # The script takes file paths as positional arguments and exits 0 immediately