mod: Ext 12 — temporal burst detection, 292/292

Reports gain an :at tick (deterministic, supplied). mod/decide-temporal counts
reports about a subject within [now-window, now], asserts burst_count/2, and a
(:burst-at-least K) rule fires only on a real burst. 3 reports at 10/11/12 → hide;
3 at 1/2/12 (window 5) → keep, while the plain count rule escalates both. Fifth
report field threaded through rebuild helpers, non-breaking. +15 tests.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/mod/conformance.conf

@@ -20,6 +20,7 @@ PRELOADS=(
   lib/mod/trace.sx
   lib/mod/whatif.sx
   lib/mod/batch.sx
+  lib/mod/temporal.sx
   lib/mod/lifecycle.sx
   lib/mod/audit.sx
   lib/mod/api.sx
@@ -42,4 +43,5 @@ SUITES=(
   "trace:lib/mod/tests/trace.sx:(mod-trace-tests-run!)"
   "whatif:lib/mod/tests/whatif.sx:(mod-whatif-tests-run!)"
   "batch:lib/mod/tests/batch.sx:(mod-batch-tests-run!)"
+  "temporal:lib/mod/tests/temporal.sx:(mod-temporal-tests-run!)"
 )