chore: patch project maps after stale backend test cleanup

Regenerate .pi-map*.md artifacts for source changes in:
- apps/api/src/api/tool/tool_types_validation.py
- apps/api/src/schemas/tool/tool_type.py
- apps/api/tests/integration/test_tool_types_api_extended.py
- and all affected test files from backend-frontend refactoring cleanup

.claude/.pi-map.index.md

@@ -2,7 +2,7 @@
 dir: .claude
 
 ## role
-Configuration and instruction files for the Claude AI assistant integration.
+Configuration directory for Claude AI assistant integration and custom instructions.
 ## parent
 index: ./.pi-map.index.md
 map: ./.pi-map.md

.claude/.pi-map.md

@@ -4,10 +4,10 @@ dir: .claude
 index: .claude/.pi-map.index.md
 
 ## role
-Configuration and instruction files for the Claude AI assistant integration.
+Configuration directory for Claude AI assistant integration and custom instructions.
 ## files
 ## arch
-Simple flat-file configuration storage with no complex architecture; contains prompt templates, system instructions, or context files used to guide Claude's behavior in this project.
+Project-specific AI tooling configuration using convention-based file organization for assistant context and behavior customization.
 ## tags
 -
 ## symbols

.claude/skills/.pi-map.index.md

@@ -2,7 +2,7 @@
 dir: .claude/skills
 
 ## role
-Empty directory placeholder for future Claude Code skill definitions or custom AI-assisted workflows.
+Contains reusable AI skill definitions and prompt templates that configure Claude's specialized capabilities for specific development tasks.
 ## parent
 index: .claude/.pi-map.index.md
 map: .claude/.pi-map.md

.claude/skills/.pi-map.md

@@ -4,10 +4,10 @@ dir: .claude/skills
 index: .claude/skills/.pi-map.index.md
 
 ## role
-Empty directory placeholder for future Claude Code skill definitions or custom AI-assisted workflows.
+Contains reusable AI skill definitions and prompt templates that configure Claude's specialized capabilities for specific development tasks.
 ## files
 ## arch
-None (no files present); likely intended for declarative skill modules using Claude's skill system pattern.
+Modular skill-based architecture using declarative configuration files (likely YAML/JSON) to define context-specific behaviors, tool access patterns, and system prompts for different operational modes.
 ## tags
 -
 ## symbols

.claude/skills/sift-backlog/.pi-map.md

@@ -8,7 +8,7 @@ Defines a workflow skill for triaging, organizing, and activating backlog tasks
 ## files
 - SKILL.md | Defines a workflow skill for triaging, organizing, and activating backlog tasks into actionable plans using a custom CLI tool. | dep: sf (custom CLI tool), task management system, plan management system
 ## arch
-Skill-based workflow automation following a structured triage pipeline (scan → filter → prioritize → activate) with CLI tool integration for backlog management.
+Documentation-driven skill definition using structured markdown with command specifications, workflow stages, and integration patterns for Claude CLI tooling.
 ## tags
 skill, defines, workflow, triaging, organizing, activating, backlog, tasks
 ## symbols