fix(git): handle -n<N> combined form in git log#2740
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git log -n<N> (e.g. -n20) was not detected by has_limit_flag or parse_user_limit, causing RTK to inject its own -10 limit and then truncate filter_log_output to 10 commits even though git correctly output the user-requested count. Add detection and parsing for the -n<digits> combined form, matching git's accepted syntax.
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The combined form git log -n (e.g., -n20) was not detected by has_limit_flag or parse_user_limit in run_log. This caused two problems: RTK injected its own -10 limit argument, and filter_log_output used limit=10 with user_set_limit=false, truncating the visible output to 10 commits even though git correctly emitted the user-requested count.
Fix has_limit_flag to detect -n as a limit flag, and add -n parsing to parse_user_limit. Both sites already handled the equivalent forms -20 and -n 20.
Includes tests for -n20 multi-digit and -n5 single-digit forms.
Fixes #2665