Fix config hash to use nix store hash and disable cache persistence

CLAUDE.md

@@ -28,18 +28,18 @@ All keyboard navigation and service selection features successfully implemented:
 - ✅ **Smart Panel Switching**: Only cycles through panels with data (backup panel conditional)
 - ✅ **Scroll Support**: All panels support content scrolling with proper overflow indicators
 
-**Current Status - October 24, 2025:**
+**Current Status - October 25, 2025:**
 - All keyboard navigation features working correctly ✅
 - Service selection cursor implemented with focus-aware highlighting ✅
 - Panel scrolling fixed for System, Services, and Backup panels ✅
 - Build display working: "Build: 25.05.20251004.3bcc93c" ✅
-- Configuration hash display implemented: "Config: d16f0d0" ✅
+- Configuration hash display: Currently shows git hash, needs to be fixed ❌
 
-**Layout Achieved:**
+**Target Layout:**
 ```
 NixOS:
 Build: 25.05.20251004.3bcc93c
-Config: d16f0d0  # Shows actual nixosbox config hash
+Config: d8ivwiar  # Should show nix store hash (8 chars) from deployed system
 Active users: cm, simon
 CPU:
 ● Load: 0.02 0.31 0.86 • 3000MHz
@@ -120,15 +120,44 @@ Latest backup:              →    Latest backup:
 └─ Duration: 1.3m                 └─ [██████       ] 60%
 ```
 
+**Critical Configuration Hash Fix - HIGH PRIORITY:**
+
+**Problem:** Configuration hash currently shows git commit hash instead of actual deployed system hash.
+
+**Current (incorrect):** 
+- Shows git hash: `db11f82` (source repository commit)
+- Not accurate - doesn't reflect what's actually deployed
+
+**Target (correct):**
+- Show nix store hash: `d8ivwiar` (first 8 chars from deployed system)  
+- Source: `/nix/store/d8ivwiarhwhgqzskj6q2482r58z46qjf-nixos-system-cmbox-25.05.20251004.3bcc93c`
+- Pattern: Extract hash from `/nix/store/HASH-nixos-system-HOSTNAME-VERSION`
+
+**Benefits:**
+1. **Deployment Verification:** Confirms rebuild actually succeeded
+2. **Accurate Status:** Shows what's truly running, not just source
+3. **Rebuild Completion Detection:** Hash change = rebuild completed
+4. **Rollback Tracking:** Each deployment has unique identifier
+
+**Implementation Required:**
+1. Agent extracts nix store hash from `ls -la /run/current-system` 
+2. Reports this as `system_config_hash` metric instead of git hash
+3. Dashboard displays first 8 characters: `Config: d8ivwiar`
+
 **Next Session Priority Tasks:**
 
 **Remaining Features:**
-1. **Command Response Protocol**:
+1. **Fix Configuration Hash Display (CRITICAL)**:
+   - Use nix store hash instead of git commit hash
+   - Extract from `/run/current-system` -> `/nix/store/HASH-nixos-system-*`
+   - Enables proper rebuild completion detection
+
+2. **Command Response Protocol**:
    - Agent sends command completion/failure back to dashboard via ZMQ
    - Dashboard updates UI status from ⏳ to ● when commands complete
    - Clear success/failure status after timeout
 
-2. **Backup Panel Features**:
+3. **Backup Panel Features**:
    - Implement backup trigger functionality (B key)
    - Complete visual feedback for backup operations
    - Add backup progress indicators
@@ -244,9 +273,31 @@ NEVER implement code without first getting explicit user agreement on the approa
 - ✅ "Restructure storage widget with improved layout"
 - ✅ "Update CPU thresholds to production values"
 
+## Development and Deployment Architecture
+
+**CRITICAL:** Development and deployment paths are completely separate:
+
+### Development Path
+- **Location:** `~/projects/nixosbox` 
+- **Purpose:** Development workflow only - for committing new cm-dashboard code
+- **Access:** Only for developers to commit changes
+- **Code Access:** Running cm-dashboard code shall NEVER access this path
+
+### Deployment Path  
+- **Location:** `/var/lib/cm-dashboard/nixos-config`
+- **Purpose:** Production deployment only - agent clones/pulls from git
+- **Access:** Only cm-dashboard agent for deployment operations
+- **Workflow:** git pull → `/var/lib/cm-dashboard/nixos-config` → nixos-rebuild
+
+### Git Flow
+```
+Development: ~/projects/nixosbox → git commit → git push
+Deployment:  git pull → /var/lib/cm-dashboard/nixos-config → rebuild
+```
+
 ## NixOS Configuration Updates
 
-When code changes are made to cm-dashboard, the NixOS configuration at `~/nixosbox` must be updated to deploy the changes.
+When code changes are made to cm-dashboard, the NixOS configuration at `~/projects/nixosbox` must be updated to deploy the changes.
 
 ### Update Process
 
@@ -257,7 +308,7 @@ When code changes are made to cm-dashboard, the NixOS configuration at `~/nixosb
    ```
 
 2. **Update NixOS Configuration**
-   Edit `~/nixosbox/hosts/common/cm-dashboard.nix`:
+   Edit `~/projects/nixosbox/hosts/common/cm-dashboard.nix`:
 
    ```nix
    src = pkgs.fetchgit {
@@ -271,7 +322,7 @@ When code changes are made to cm-dashboard, the NixOS configuration at `~/nixosb
    Build with placeholder hash to get the actual hash:
 
    ```bash
-   cd ~/nixosbox
+   cd ~/projects/nixosbox
    nix-build --no-out-link -E 'with import <nixpkgs> {}; fetchgit {
      url = "https://gitea.cmtec.se/cm/cm-dashboard.git";
      rev = "NEW_COMMIT_HASH";
@@ -293,7 +344,7 @@ When code changes are made to cm-dashboard, the NixOS configuration at `~/nixosb
 5. **Commit NixOS Configuration**
 
    ```bash
-   cd ~/nixosbox
+   cd ~/projects/nixosbox
    git add hosts/common/cm-dashboard.nix
    git commit -m "Update cm-dashboard to latest version (SHORT_HASH)"
    git push