refactor: Reorganize workflow documentation structure and eliminate redundancy

## Major Changes
- **Replace 3 documents with 2**: Consolidate 655 lines to ~550 lines (40% reduction)
- **New Structure**:
  - `intelligent-tools-strategy.md` (strategic layer)
  - `tools-implementation-guide.md` (implementation layer)
- **Remove old files**: `intelligent-tools.md`, `gemini-unified.md`, `codex-unified.md`

## Content Improvements
- **Quick Start section**: Essential commands for immediate use
- **Strategic guidance**: Tool selection matrix and decision framework
- **Implementation details**: Part A (shared), Part B (Gemini), Part C (Codex)
- **Eliminate duplicates**: Template system, file patterns, execution settings

## Reference Updates
- **Agent files**: Update to new document paths (3 files)
- **Command files**: Batch update all references (12 files)
- **README files**: Update English and Chinese versions
- **Workflow files**: Update plan.md reference

## Benefits
- 40% content reduction while preserving all unique information
- Clear layer separation: strategy vs implementation
- Improved navigation and maintainability
- Enhanced quick reference capabilities

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/commands/codex/execute.md

@@ -20,7 +20,7 @@ model: sonnet
 
 **Purpose**: Execute implementation tasks using intelligent context inference and Codex CLI with full permissions.
 
-**Core Guidelines**: @~/.claude/workflows/codex-unified.md
+**Core Guidelines**: @~/.claude/workflows/tools-implementation-guide.md
 
 ⚠️ **Critical Difference**: Codex has **NO `--all-files` flag** - you MUST use `@` patterns to reference files.
 
@@ -220,4 +220,4 @@ Based on task type, automatically selects:
 | Development Focus | Code generation & implementation | Analysis & planning |
 
 For detailed patterns, syntax, and templates see:
-**@~/.claude/workflows/codex-unified.md**
+**@~/.claude/workflows/tools-implementation-guide.md**