feat: add semantic graph design for static code analysis

- Introduced a comprehensive design document for a Code Semantic Graph aimed at enhancing static analysis capabilities.
- Defined the architecture, core components, and implementation steps for analyzing function calls, data flow, and dependencies.
- Included detailed specifications for nodes and edges in the graph, along with database schema for storage.
- Outlined phases for implementation, technical challenges, success metrics, and application scenarios.

.claude/rules/file-modification.md

@@ -45,3 +45,49 @@
 **Use semantic search** for exploratory tasks
 **Use indexed search** for large, stable codebases
 **Use Exa** for external/public knowledge
+
+## ⚡ Core Search Tools
+
+**rg (ripgrep)**: Fast content search with regex support
+**find**: File/directory location by name patterns
+**grep**: Built-in pattern matching (fallback when rg unavailable)
+**get_modules_by_depth**: Program architecture analysis (MANDATORY before planning)
+
+
+## 🔧 Quick Command Reference
+
+```bash
+# Semantic File Discovery (codebase-retrieval via CCW)
+ccw cli exec "
+PURPOSE: Discover files relevant to task/feature
+TASK: • List all files related to [task/feature description]
+MODE: analysis
+CONTEXT: @**/*
+EXPECTED: Relevant file paths with relevance explanation
+RULES: Focus on direct relevance to task requirements | analysis=READ-ONLY
+" --tool gemini --cd [directory]
+
+# Program Architecture (MANDATORY before planning)
+ccw tool exec get_modules_by_depth '{}'
+
+# Content Search (rg preferred)
+rg "pattern" --type js -n        # Search JS files with line numbers
+rg -i "case-insensitive"         # Ignore case
+rg -C 3 "context"                # Show 3 lines before/after
+
+# File Search
+find . -name "*.ts" -type f      # Find TypeScript files
+find . -path "*/node_modules" -prune -o -name "*.js" -print
+
+# Workflow Examples
+rg "IMPL-\d+" .workflow/ --type json                    # Find task IDs
+find .workflow/ -name "*.json" -path "*/.task/*"        # Locate task files
+rg "status.*pending" .workflow/.task/                   # Find pending tasks
+```
+
+## ⚡ Performance Tips
+
+- **rg > grep** for content search
+- **Use --type filters** to limit file types
+- **Exclude dirs**: `--glob '!node_modules'`
+- **Use -F** for literal strings (no regex)