Bug: SLM git_tracker fails in Docker — git not installed

[mrveiss]

Problem

SLM git_tracker service repeatedly errors because git is not installed in the Docker container:

services.git_tracker - ERROR - Error running git command: [Errno 2] No such file or directory
services.git_tracker - WARNING - Failed to get remote commit hash

Fix Options

1. Install git in SLM Docker image (adds ~50MB)
2. Make git_tracker gracefully degrade when git is unavailable
3. Disable git_tracker in Docker deployments via env var

Discovered During

Working on #1809 (Docker containerization)

Impact

Low — Non-fatal, SLM runs fine. Pollutes logs every 5 minutes.

[mrveiss]

Fix implemented in PR #1926 (branch fix/docker-bugs-batch). Awaiting merge to Dev_new_gui.

[mrveiss]

Merged in PR #1926 (Docker bugs batch fix).