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/ARCHITECTURE.md

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+# Architecture
+
+## Core Sections (Required)
+
+### 1) Architectural Style
+
+- Primary style: [layered/feature/event-driven/other]
+- Why this classification: [short evidence-backed rationale]
+- Primary constraints: [2-3 constraints that shape design]
+
+### 2) System Flow
+
+```text
+[entry] -> [processing] -> [domain logic] -> [data/integration] -> [response/output]
+```
+
+Describe the flow in 4-6 steps using file-backed evidence.
+
+### 3) Layer/Module Responsibilities
+
+| Layer or module | Owns | Must not own | Evidence |
+|-----------------|------|--------------|----------|
+| [name] | [responsibility] | [non-responsibility] | [file] |
+
+### 4) Reused Patterns
+
+| Pattern | Where found | Why it exists |
+|---------|-------------|---------------|
+| [singleton/repository/adapter/etc] | [path] | [reason] |
+
+### 5) Known Architectural Risks
+
+- [Risk 1 + impact]
+- [Risk 2 + impact]
+
+### 6) Evidence
+
+- [path/to/entrypoint]
+- [path/to/main-layer-files]
+- [path/to/data-or-integration-layer]
+
+## Extended Sections (Optional)
+
+Add only when needed:
+
+- Startup or initialization order details
+- Async/event topology diagrams
+- Anti-pattern catalog with refactoring paths
+- Failure-mode analysis and resilience posture