Add CMFRT naming conventions, object ID ranges, and patterns documentation

- Introduced guidelines for using the "CMFRT" prefix in object names, fields, and procedures to avoid naming collisions and ensure clarity.
- Established rules for object ID ranges to prevent conflicts with other extensions and maintain historical integrity.
- Documented best practices and anti-patterns for various coding patterns, including case statements, interface injection, label usage, and validation methods.
- Implemented a standards review skill to evaluate AL source changes against CMFRT company standards, ensuring compliance with naming, permissions, and architectural patterns.

custom/knowledge/patterns/cmfrt-maxstrlen-copystr.md

@@ -0,0 +1,26 @@
+---
+bc-version: [all]
+domain: patterns
+keywords: [maxstrlen, copystr, truncation, magic-number, field-length, overflow, string]
+technologies: [al]
+countries: [w1]
+application-area: [all]
+---
+
+# CMFRT use MaxStrLen in CopyStr, never a literal length
+
+## Description
+
+When CMFRT code truncates a text value to fit a field, the length argument of `CopyStr` must be `MaxStrLen(TargetRecord.TargetField)`, never a numeric literal. The field is the single source of truth for its own length; a hardcoded number silently diverges the moment the field is widened or the code is copied to a field of a different size, producing either needless truncation or a runtime overflow error.
+
+## Best Practice
+
+Write `Rec."CMFRT AQ User ID" := CopyStr(UserId(), 1, MaxStrLen(Rec."CMFRT AQ User ID"));`. The expression stays correct through any future field-length change and documents intent: truncate to whatever fits the target.
+
+See sample: `cmfrt-maxstrlen-copystr.good.al`.
+
+## Anti Pattern
+
+`CopyStr(UserId(), 1, 50)` — the literal encodes the field length at the time of writing. Widening the field leaves data truncated at the stale length; narrowing it turns the assignment into a runtime "length exceeds" error that only fires on long values in production.
+
+See sample: `cmfrt-maxstrlen-copystr.bad.al`.