chore: ignore framework LOGFILENAME timestamp artifacts

The framework defines LOGFILENAME as "$0.<Weekday>-YYYY-MM-DD-HH:MM:SS.$$"
and PrettyPrint appends every print_info/print_error line to it, so
executing any script that sources the framework leaves a timestamped log
file beside it (e.g. run-tests.sh.Monday-2026-07-27-10:44:31.123). These
are runtime artifacts, not source, and were showing up as untracked
noise. Ignore them across the whole repo.

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.gitignore

@@ -0,0 +1,12 @@
+# LOGFILENAME artifacts: the framework (Logging.sh + PrettyPrint.sh) appends
+# every print_info/print_error line to LOGFILENAME, defined as
+# "$0.<Weekday>-YYYY-MM-DD-HH:MM:SS.$$". Running any script that sources the
+# framework therefore drops a timestamped log file next to it. Ignore these
+# everywhere in the repo.
+*.Monday-*
+*.Tuesday-*
+*.Wednesday-*
+*.Thursday-*
+*.Friday-*
+*.Saturday-*
+*.Sunday-*