fix: rename sampling TEMP var to TEMPERATURE to avoid HIP runtime env collision

The ROCm HIP runtime (libamdhip64) reads the TEMP environment variable as
its JIT kernel-cache temp directory. Commit db3eb01 added TEMP=1.0 to the
env files as a sampling default; the serve scripts export it via set -a.
HIP then used the path "1.0" for its cache, failed, and segfaulted with a
NULL-refcount unref (offset 0x446153 in libamdhip64) during model tensor
upload (ggml_backend_cuda_buffer_set_tensor). This crashed frank-default-
large on every restart from Aug 13 16:22 onward; the earlier c984a3e
"fix" (KV/batch changes) was unrelated.

Rename the sampling variable TEMP -> TEMPERATURE in both env files and
serve scripts. llama-server still receives --temp from the renamed var, so
sampling defaults are unchanged. The HIP runtime no longer sees a bogus
TEMP value. Affects frank-default-large (dankclaw) and frank-default-small
(dankserver).

scripts/frank-default-large.env

@@ -36,7 +36,10 @@ UBATCH_SIZE=512
 # Sampling settings — per HauhauCS Qwen3.6-27B model card.
 # Thinking-general: temp=1.0, top_p=0.95, top_k=20, min_p=0.
 # Clients may override per-request; these are the server-side defaults.
-TEMP=1.0
+# WARNING: do not name this variable TEMP. The ROCm HIP runtime reads the
+# TEMP environment variable (JIT kernel-cache dir); TEMP=1.0 made the HIP
+# runtime SEGV (NULL unref) during model load on Aug 13 2026.
+TEMPERATURE=1.0
 TOP_K=20
 TOP_P=0.95
 MIN_P=0.0