Default GAME_POLL_INTERVAL to 15s: nvidia-smi polls keep the GPU awake

SPEC.md

@@ -159,7 +159,7 @@ process instead of expecting an always-on server:
 
 Games and other foreign GPU users sit outside the URL-based consumer model —
 nothing proxies through gpu-turnstile for them. Two independent detection
-paths, polled every `GAME_POLL_INTERVAL` (default 5 s); either one being
+paths, polled every `GAME_POLL_INTERVAL` (default 15 s); either one being
 configured enables the feature:
 
 - **Process watch list** (`GAME_PROCS`, comma-separated, case-insensitive,
@@ -218,7 +218,7 @@ override file values. A missing file is fine; a malformed one is fatal.
 | `GAME_PROCS` | _(empty = disabled)_ | comma-separated process names (case-insensitive, `.exe` optional); while any runs, the GPU counts as held by it: requests wait, Ollama unloads, the managed ComfyUI stops |
 | `GPU_FOREIGN_VRAM_MB` | `0` (disabled) | also treat the GPU as held when a process not in `GPU_IGNORE_PROCS` uses more VRAM than this; needs nvidia-smi |
 | `GPU_IGNORE_PROCS` | `ollama,ollama app,ollama_llama_server,python,pythonw` | process names never counted as foreign GPU users |
-| `GAME_POLL_INTERVAL` | `5s` | how often game/VRAM detection runs |
+| `GAME_POLL_INTERVAL` | `15s` | how often game/VRAM detection runs (nvidia-smi polls keep the GPU awake; don't go below ~10s) |
 | `LOGLEVEL` | `warn` | `info` logs every request (colored arrows in text mode), `debug` adds lock transitions. `LOG_LEVEL` is accepted as an alias |
 | `LOG_FORMAT` | `text` | `json` for structured JSON logs |
 | `LOG_FILE` | `` | append logs to this file instead of stderr (useful as a service) |