feat: implement enterprise workflow with multi-backend support

## Overview
Complete implementation of enterprise-level workflow features including
multi-backend execution (Codex/Claude/Gemini), GitHub issue-to-PR automation,
hooks system, and comprehensive documentation.

## Major Changes

### 1. Multi-Backend Support (codeagent-wrapper)
- Renamed codex-wrapper → codeagent-wrapper
- Backend interface with Codex/Claude/Gemini implementations
- Multi-format JSON stream parser (auto-detects backend)
- CLI flag: --backend codex|claude|gemini (default: codex)
- Test coverage: 89.2%

**Files:**
- codeagent-wrapper/backend.go - Backend interface
- codeagent-wrapper/parser.go - Multi-format parser
- codeagent-wrapper/config.go - CLI parsing with backend selection
- codeagent-wrapper/executor.go - Process execution
- codeagent-wrapper/logger.go - Async logging
- codeagent-wrapper/utils.go - Utilities

### 2. GitHub Workflow Commands
- /gh-create-issue - Create structured issues via guided dialogue
- /gh-implement - Issue-to-PR automation with full dev lifecycle

**Files:**
- github-workflow/commands/gh-create-issue.md
- github-workflow/commands/gh-implement.md
- skills/codeagent/SKILL.md

### 3. Hooks System
- UserPromptSubmit hook for skill activation
- Pre-commit example with code quality checks
- merge_json operation in install.py for settings.json merging

**Files:**
- hooks/skill-activation-prompt.sh|.js
- hooks/pre-commit.sh
- hooks/hooks-config.json
- hooks/test-skill-activation.sh

### 4. Skills System
- skill-rules.json for auto-activation
- codeagent skill for multi-backend wrapper

**Files:**
- skills/skill-rules.json
- skills/codeagent/SKILL.md
- skills/codex/SKILL.md (updated)

### 5. Installation System
- install.py: Added merge_json operation
- config.json: Added "gh" module
- config.schema.json: Added op_merge_json schema

### 6. CI/CD
- GitHub Actions workflow for testing and building

**Files:**
- .github/workflows/ci.yml

### 7. Comprehensive Documentation
- Architecture overview with ASCII diagrams
- Codeagent-wrapper complete usage guide
- GitHub workflow detailed examples
- Hooks customization guide

**Files:**
- docs/architecture.md (21KB)
- docs/CODEAGENT-WRAPPER.md (9KB)
- docs/GITHUB-WORKFLOW.md (9KB)
- docs/HOOKS.md (4KB)
- docs/enterprise-workflow-ideas.md
- README.md (updated with doc links)

## Test Results
- All tests passing ✅
- Coverage: 89.2%
- Security scan: 0 issues (gosec)

## Breaking Changes
- codex-wrapper renamed to codeagent-wrapper
- Default backend: codex (documented in README)

## Migration Guide
Users with codex-wrapper installed should:
1. Run: python3 install.py --module dev --force
2. Update shell aliases if any

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  push:
+    branches: [master, rc/*]
+  pull_request:
+    branches: [master, rc/*]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.21'
+
+      - name: Run tests
+        run: |
+          cd codeagent-wrapper
+          go test -v -cover -coverprofile=coverage.out ./...
+
+      - name: Check coverage
+        run: |
+          cd codeagent-wrapper
+          go tool cover -func=coverage.out | grep total | awk '{print $3}'
+
+      - name: Validate JSON configs
+        run: |
+          jq empty .claude/settings.json
+          jq empty .claude/skills/skill-rules.json
+
+      - name: Upload coverage
+        uses: codecov/codecov-action@v4
+        with:
+          file: codeagent-wrapper/coverage.out
+        continue-on-error: true

.github/workflows/release.yml

@@ -1,4 +1,4 @@
-name: Release codex-wrapper
+name: Release codeagent-wrapper
 
 on:
   push:
@@ -22,11 +22,11 @@ jobs:
           go-version: '1.21'
 
       - name: Run tests
-        working-directory: codex-wrapper
+        working-directory: codeagent-wrapper
         run: go test -v -coverprofile=cover.out ./...
 
       - name: Check coverage
-        working-directory: codex-wrapper
+        working-directory: codeagent-wrapper
         run: |
           go tool cover -func=cover.out | grep total
           COVERAGE=$(go tool cover -func=cover.out | grep total | awk '{print $3}' | sed 's/%//')
@@ -58,22 +58,22 @@ jobs:
           go-version: '1.21'
 
       - name: Build binary
-        working-directory: codex-wrapper
+        working-directory: codeagent-wrapper
         env:
           GOOS: ${{ matrix.goos }}
           GOARCH: ${{ matrix.goarch }}
           CGO_ENABLED: 0
         run: |
           VERSION=${GITHUB_REF#refs/tags/}
-          OUTPUT_NAME=codex-wrapper-${{ matrix.goos }}-${{ matrix.goarch }}
+          OUTPUT_NAME=codeagent-wrapper-${{ matrix.goos }}-${{ matrix.goarch }}
           go build -ldflags="-s -w -X main.version=${VERSION}" -o ${OUTPUT_NAME} .
           chmod +x ${OUTPUT_NAME}
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4
         with:
-          name: codex-wrapper-${{ matrix.goos }}-${{ matrix.goarch }}
-          path: codex-wrapper/codex-wrapper-${{ matrix.goos }}-${{ matrix.goarch }}
+          name: codeagent-wrapper-${{ matrix.goos }}-${{ matrix.goarch }}
+          path: codeagent-wrapper/codeagent-wrapper-${{ matrix.goos }}-${{ matrix.goarch }}
 
   release:
     name: Create Release
@@ -91,7 +91,7 @@ jobs:
       - name: Prepare release files
         run: |
           mkdir -p release
-          find artifacts -type f -name "codex-wrapper-*" -exec mv {} release/ \;
+          find artifacts -type f -name "codeagent-wrapper-*" -exec mv {} release/ \;
           cp install.sh release/
           ls -la release/