DOC: Address thewtex review comments in AGENTS.md and testing.md

- AGENTS.md: Use 'The Insight Toolkit (ITK)' (full name first)
- AGENTS.md: Rename section to 'Context to Load on Demand'
- AGENTS.md: Expand conventions.md row to 'Writing ITK C++ classes,
  CMake build configuration, and Python wrapping configuration'
- AGENTS.md: Add ./ prefix and Markdown links to all context file paths
- testing.md: Prefix all ctest commands with 'pixi run --as-is' so
  they succeed on systems without system-level ctest in PATH

Author: hjmjohnson

AGENTS.md

@@ -1,22 +1,22 @@
 # ITK AI Agent Guide
 
-ITK (Insight Toolkit) is a cross-platform, open-source C++ toolkit for
+The Insight Toolkit (ITK) is a cross-platform, open-source C++ toolkit for
 N-dimensional scientific image processing, segmentation, and registration.
 Apache 2.0 licensed. Build tool: **Pixi** (wraps CMake + Ninja).
 
-## Context on Demand
+## Context to Load on Demand
 
 Load only what your task requires:
 
 | Task | Read |
 |------|------|
-| Understanding the codebase layout | `Documentation/AI/architecture.md` |
-| Building or configuring ITK | `Documentation/AI/building.md` |
-| Writing or running tests | `Documentation/AI/testing.md` |
-| Code style, naming conventions | `Documentation/AI/style.md` |
-| Writing ITK C++ or Python | `Documentation/AI/conventions.md` |
-| Creating a git commit | `Documentation/AI/git-commits.md` |
-| Opening or updating a pull request | `Documentation/AI/pull-requests.md` |
+| Understanding the codebase layout | [./Documentation/AI/architecture.md](./Documentation/AI/architecture.md) |
+| Building or configuring ITK | [./Documentation/AI/building.md](./Documentation/AI/building.md) |
+| Writing or running tests | [./Documentation/AI/testing.md](./Documentation/AI/testing.md) |
+| Code style, naming conventions | [./Documentation/AI/style.md](./Documentation/AI/style.md) |
+| Writing ITK C++ classes, CMake build configuration, and Python wrapping configuration | [./Documentation/AI/conventions.md](./Documentation/AI/conventions.md) |
+| Creating a git commit | [./Documentation/AI/git-commits.md](./Documentation/AI/git-commits.md) |
+| Opening or updating a pull request | [./Documentation/AI/pull-requests.md](./Documentation/AI/pull-requests.md) |
 
 ## Critical Pitfalls
 

Documentation/AI/testing.md

@@ -2,19 +2,15 @@
 
 ## Running Tests
 
+Via Pixi (recommended — works even without system-level cmake/ctest):
 ```bash
-cd build
-ctest -j8                    # All tests in parallel
-ctest -R ImageFilter         # Tests matching regex
-ctest -L REQUIRES_GPU        # Tests with label
-ctest --rerun-failed         # Only previously failed tests
-ctest -L ITKCommon           # Tests for a specific module
-```
-
-Via Pixi (recommended):
-```bash
-pixi run --as-is test           # C++ tests
-pixi run --as-is test-python    # Python tests
+pixi run --as-is test                        # All C++ tests
+pixi run --as-is test-python                 # Python tests
+pixi run --as-is ctest -j8                   # All tests in parallel
+pixi run --as-is ctest -R ImageFilter        # Tests matching regex
+pixi run --as-is ctest -L REQUIRES_GPU       # Tests with label
+pixi run --as-is ctest --rerun-failed        # Only previously failed tests
+pixi run --as-is ctest -L ITKCommon          # Tests for a specific module
 ```
 
 ## Test Organization