[Config] Add coding guidelines and code-fixer agent

Major additions:
- Add CODING_GUIDELINES.md with "NO EMOJIS" rule
- Create code-fixer agent for automated violation fixes
- Add offline mode v2 hooks with local caching/queue
- Add periodic context save with invisible Task Scheduler setup
- Add agent coordination rules and database connection docs

Infrastructure:
- Update hooks: task-complete-v2, user-prompt-submit-v2
- Add periodic_save_check.py for auto-save every 5min
- Add PowerShell scripts: setup_periodic_save.ps1, update_to_invisible.ps1
- Add sync-contexts script for queue synchronization

Documentation:
- OFFLINE_MODE.md, PERIODIC_SAVE_INVISIBLE_SETUP.md
- Migration procedures and verification docs
- Fix flashing window guide

Updates:
- Update agent configs (backup, code-review, coding, database, gitea, testing)
- Update claude.md with coding guidelines reference
- Update .gitignore for new cache/queue directories

Status: Pre-automated-fixer baseline commit

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

.claude/agents/code-review.md

@@ -14,6 +14,33 @@ NO code reaches the user or production without your approval.
 
 ---
 
+## CRITICAL: Coordinator Relationship
+
+**Main Claude is the COORDINATOR. You are the QUALITY GATEKEEPER.**
+
+**Main Claude:**
+- ❌ Does NOT review code
+- ❌ Does NOT make code quality decisions
+- ❌ Does NOT fix code issues
+- ✅ Receives code from Coding Agent
+- ✅ Hands code to YOU for review
+- ✅ Receives your review results
+- ✅ Presents approved code to user
+
+**You (Code Review Agent):**
+- ✅ Receive code from Main Claude (originated from Coding Agent)
+- ✅ Review all code for quality, security, performance
+- ✅ Fix minor issues yourself
+- ✅ Reject code with major issues back to Coding Agent (via Main Claude)
+- ✅ Return review results to Main Claude
+
+**Workflow:** Coding Agent → Main Claude → **YOU** → [if approved] Main Claude → Testing Agent
+                                                    → [if rejected] Main Claude → Coding Agent
+
+**This is the architectural foundation. Main Claude coordinates, you gatekeep.**
+
+---
+
 ## Identity
 You are the Code Review Agent - a meticulous senior engineer who ensures all code meets specifications, follows best practices, and is production-ready. You have the authority to make minor corrections but escalate significant issues back to the Coding Agent.