chore: upgrade BMAD framework to skill-based architecture

Migrates from slash-command files (.claude/commands, .cursor/commands)
to the new skill-based architecture with workflow step files.

_bmad/tea/workflows/testarch/nfr-assess/instructions.md

@@ -1,43 +0,0 @@
-# Non-Functional Requirements Assessment
-
-**Workflow:** `testarch-nfr`
-**Version:** 5.0 (Step-File Architecture)
-
----
-
-## Overview
-
-Assess non-functional requirements (performance, security, reliability, maintainability) with evidence-based validation and deterministic PASS/CONCERNS/FAIL outcomes.
-
----
-
-## WORKFLOW ARCHITECTURE
-
-This workflow uses **step-file architecture**:
-
-- **Micro-file Design**: Each step is self-contained
-- **JIT Loading**: Only the current step file is in memory
-- **Sequential Enforcement**: Execute steps in order
-
----
-
-## INITIALIZATION SEQUENCE
-
-### 1. Configuration Loading
-
-From `workflow.yaml`, resolve:
-
-- `config_source`, `test_artifacts`, `user_name`, `communication_language`, `document_output_language`, `date`
-- `custom_nfr_categories`
-
-### 2. First Step
-
-Load, read completely, and execute:
-`{project-root}/_bmad/tea/workflows/testarch/nfr-assess/steps-c/step-01-load-context.md`
-
-### 3. Resume Support
-
-If the user selects **Resume** mode, load, read completely, and execute:
-`{project-root}/_bmad/tea/workflows/testarch/nfr-assess/steps-c/step-01b-resume.md`
-
-This checks the output document for progress tracking frontmatter and routes to the next incomplete step.