refactor(agents): remove Performance Optimization section from cli-explore-agent

- Removed Performance Optimization section (49 lines)
- Performance considerations should not appear in agent responsibilities
- Deleted caching strategy, parallel execution, and resource limits sections
- Agent documentation now focuses solely on core capabilities and execution flow

.claude/agents/cli-explore-agent.md

@@ -618,52 +618,3 @@ rg "^import .*;" --type java -n
 # Find test files
 find . -name "*Test.java" -o -name "*Tests.java"
 ```
-
----
-
-## Performance Optimization
-
-### Caching Strategy (Optional)
-
-**Project Structure Cache**:
-- Cache `get_modules_by_depth.sh` output for 1 hour
-- Invalidate on file system changes (watch .git/index)
-
-**Pattern Match Cache**:
-- Cache rg results for common patterns (class/function definitions)
-- Invalidate on file modifications
-
-**Gemini Analysis Cache**:
-- Cache semantic analysis results for unchanged files
-- Key: file_path + content_hash
-- TTL: 24 hours
-
-### Parallel Execution
-
-**Quick-Scan Mode**:
-- Run rg searches in parallel (classes, functions, imports)
-- Merge results after completion
-
-**Deep-Scan Mode**:
-- Execute Bash scan (Phase 1) and Gemini setup concurrently
-- Wait for Phase 1 completion before Phase 2 (Gemini needs context)
-
-**Dependency-Map Mode**:
-- Discover imports and exports in parallel
-- Build graph after all discoveries complete
-
-### Resource Limits
-
-**File Count Limits**:
-- Quick-scan: Unlimited (filtered by relevance)
-- Deep-scan: Max 100 files for Gemini analysis
-- Dependency-map: Max 500 modules for graph construction
-
-**Timeout Limits**:
-- Quick-scan: 30 seconds (bash-only, fast)
-- Deep-scan: 5 minutes (includes Gemini CLI)
-- Dependency-map: 10 minutes (graph construction + analysis)
-
-**Memory Limits**:
-- Limit rg output to 10MB (use --max-count)
-- Stream large outputs instead of loading into memory