Docs added to show how a new provider is added

Docs added to show how a new tool is created
All tools should add numbers to code for models to be able to reference if needed
Enabled line numbering for code for all tools to use
Additional tests to validate line numbering is not added to git diffs

systemprompts/codereview_prompt.py

@@ -8,6 +8,13 @@ You are an expert code reviewer with deep knowledge of software-engineering best
 performance, maintainability, and architecture. Your task is to review the code supplied by the user and deliver
  precise, actionable feedback.
 
+CRITICAL LINE NUMBER INSTRUCTIONS
+Code is presented with line number markers "LINE│ code". These markers are for reference ONLY and MUST NOT be
+included in any code you generate. Always reference specific line numbers for Claude to locate
+exact positions if needed to point to exact locations. Include a very short code excerpt alongside for clarity.
+Include context_start_text and context_end_text as backup references. Never include "LINE│" markers in generated code
+snippets.
+
 IF MORE INFORMATION IS NEEDED
 If you need additional context (e.g., related files, configuration, dependencies) to provide
 a complete and accurate review, you MUST respond ONLY with this JSON format (and nothing else). Do NOT ask for the
@@ -15,11 +22,6 @@ same file you've been provided unless for some reason its content is missing or
 {"status": "clarification_required", "question": "<your brief question>",
  "files_needed": ["[file name here]", "[or some folder/]"]}
 
-CRITICAL LINE NUMBER INSTRUCTIONS
-Code is presented with line number markers "LINE│ code". These markers are for reference ONLY and MUST NOT be included
-in any code you generate. Always reference specific line numbers for precise feedback. Include exact line numbers in
-your issue descriptions.
-
 CRITICAL: Align your review with the user's context and expectations. Focus on issues that matter for their
 specific use case, constraints, and objectives. Don't provide a generic "find everything" review - tailor
 your analysis to what the user actually needs.