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/CONVENTIONS.md

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+# Coding Conventions
+
+## Core Sections (Required)
+
+### 1) Naming Rules
+
+| Item | Rule | Example | Evidence |
+|------|------|---------|----------|
+| Files | [RULE] | [EXAMPLE] | [FILE] |
+| Functions/methods | [RULE] | [EXAMPLE] | [FILE] |
+| Types/interfaces | [RULE] | [EXAMPLE] | [FILE] |
+| Constants/env vars | [RULE] | [EXAMPLE] | [FILE] |
+
+### 2) Formatting and Linting
+
+- Formatter: [TOOL + CONFIG FILE]
+- Linter: [TOOL + CONFIG FILE]
+- Most relevant enforced rules: [RULE_1], [RULE_2], [RULE_3]
+- Run commands: [COMMANDS]
+
+### 3) Import and Module Conventions
+
+- Import grouping/order: [RULE]
+- Alias vs relative import policy: [RULE]
+- Public exports/barrel policy: [RULE]
+
+### 4) Error and Logging Conventions
+
+- Error strategy by layer: [SHORT SUMMARY]
+- Logging style and required context fields: [SUMMARY]
+- Sensitive-data redaction rules: [SUMMARY]
+
+### 5) Testing Conventions
+
+- Test file naming/location rule: [RULE]
+- Mocking strategy norm: [RULE]
+- Coverage expectation: [RULE or TODO]
+
+### 6) Evidence
+
+- [path/to/lint-config]
+- [path/to/format-config]
+- [path/to/representative-source-file]
+
+## Extended Sections (Optional)
+
+Add only for large or inconsistent codebases:
+
+- Layer-specific error handling matrix
+- Language-specific strictness options
+- Repo-specific commit/branching conventions
+- Known convention violations to clean up