chore(git): track logs dir; ignore runtime state files

Add logs/.gitkeep to track directory structure. Extend .gitignore with
logs/fires, logs/pause.flag, logs/detections/, and configs/current.txt.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -46,14 +46,18 @@ ENV/
 # ATM runtime artefacts
 logs/*.jsonl
 logs/dead_letter.jsonl
+logs/detections/
+logs/fires
+logs/pause.flag
 samples/*.png
 samples/*.jpg
 samples/labels.json
 trades.jsonl
 
-# configs: keep template + current marker, not generated calibration
+# configs: keep template only; ignore generated calibration and runtime state
 configs/*.toml
 !configs/example.toml
+configs/current.txt
 
 # Claude scheduler state
 .claude/