Adds a new Agent Skill - Acquire-Codebase-Knowledge (#1373)

* feat(skill): add acquire-codebase-knowledge skill documentation

* feat(templates): add architecture, concerns, conventions, integrations, stack, structure, and testing documentation templates

* feat(references): add inquiry checkpoints and stack detection documentation

* feat(scan): add script to collect project discovery information for acquire-codebase-knowledge skill

* feat(skills): add acquire-codebase-knowledge skill for codebase mapping and documentation

* feat(scan): enhance scan script with absolute path handling and improved output variable validation

* feat(scan): replace bash script with Python script for project discovery information collection

* feat(skills): update acquire-codebase-knowledge skill to replace scan.sh with scan.py

skills/acquire-codebase-knowledge/assets/templates/CONCERNS.md

@@ -0,0 +1,56 @@
+# Codebase Concerns
+
+## Core Sections (Required)
+
+### 1) Top Risks (Prioritized)
+
+| Severity | Concern | Evidence | Impact | Suggested action |
+|----------|---------|----------|--------|------------------|
+| [high/med/low] | [issue] | [file or scan output] | [impact] | [next action] |
+
+### 2) Technical Debt
+
+List the most important debt items only.
+
+| Debt item | Why it exists | Where | Risk if ignored | Suggested fix |
+|-----------|---------------|-------|-----------------|---------------|
+| [item] | [reason] | [path] | [risk] | [fix] |
+
+### 3) Security Concerns
+
+| Risk | OWASP category (if applicable) | Evidence | Current mitigation | Gap |
+|------|--------------------------------|----------|--------------------|-----|
+| [risk] | [A01/A03/etc or N/A] | [path] | [what exists] | [what is missing] |
+
+### 4) Performance and Scaling Concerns
+
+| Concern | Evidence | Current symptom | Scaling risk | Suggested improvement |
+|---------|----------|-----------------|-------------|-----------------------|
+| [issue] | [path/metric] | [symptom] | [risk] | [action] |
+
+### 5) Fragile/High-Churn Areas
+
+| Area | Why fragile | Churn signal | Safe change strategy |
+|------|-------------|-------------|----------------------|
+| [path] | [reason] | [recent churn evidence] | [approach] |
+
+### 6) `[ASK USER]` Questions
+
+Add unresolved intent-dependent questions as a numbered list.
+
+1. [ASK USER] [question]
+
+### 7) Evidence
+
+- [scan output section reference]
+- [path/to/code-file]
+- [path/to/config-or-history-evidence]
+
+## Extended Sections (Optional)
+
+Add only when needed:
+
+- Full bug inventory
+- Component-level remediation roadmap
+- Cost/effort estimates by concern
+- Dependency-risk and ownership mapping