fix: address PR #10 CodeRabbit review feedback

- Fix SC2115 shellcheck warning in build.sh (use ${var:?} for safe rm -rf)
- Fix SC2164 shellcheck warning in build.sh (cd build || exit 1)
- Standardise bullet points from hyphens to asterisks in .wiki/Contributing.md
- Refine verb formality in readme.txt, README.md, .wiki/Contributing.md, .wiki/Coding-Standards.md
- Clarify PHPDoc wording in .wiki/Coding-Standards.md
- Add clarifying comment to phpcs-simple.xml arg value

.wiki/Coding-Standards.md

@@ -67,7 +67,7 @@ if ($condition) {
 ### Documentation
 
 * All classes, methods, and functions should be documented using PHPDoc
-* Include a description, parameters, return values, and exceptions
+* Include descriptions of parameters, return values, and any exceptions thrown
 
 ```php
 /**
@@ -271,7 +271,7 @@ To ensure your code passes the quality checks from these tools, follow these gui
 3. **Using AI Assistants with Code Quality Tools**
    * When you receive feedback from code quality tools, you can use AI assistants to help address the issues
    * Copy the output from the code quality tool and paste it into your AI assistant chat
-   * Ask the AI to help you understand and resolve the issues
+   * Request the AI's assistance to interpret and resolve the reported issues
    * Example prompt:
 
      ```text