lib: split log tests into funcs+global per ref/hare/log

Pure move: log_test.ww dissolves along its banner seams into
funcs_test.ww (the six logger-arg rows — lprintlnbasic/single/empty,
lprintflnbasic/indexed/mods — plus the fatal-family subprocess TODO;
ref/hare/log/funcs.ha owns lprintln/lprintfln and the fatal/lfatal
forms) and global_test.ww (defaultwiredtoglobal, setloggerswap,
printflnglobal; ref/hare/log/global.ha owns default/global/setlogger).
Moved blocks are byte-identical; the 9 banner lines are deleted.
Imports minimized per file (log + memio; the stale fmt/io imports
drop).

Helper inventory: streq spans both halves (all six funcs rows;
setloggerswap + printflnglobal on the global side), so it is
duplicated under per-file names per the sanctioned strconv
streq/fstreq precedent — fstreq in funcs_test.ww (decl + 6 call
sites), gstreq in global_test.ww (decl + 6 call sites); bodies
byte-identical apart from the name. Line-multiset diff old-vs-concat
(heads/banners excluded, names normalized): the only residue is the
9-line streq helper counted twice.

Order-safety, proven on the composed run: dir-mode executes
declaration order per file, files byte-lexicographic (funcs_test <
global_test < silent_test). Observed order: lprintlnbasic,
lprintlnsingle, lprintlnempty, lprintflnbasic, lprintflnindexed,
lprintflnmods, defaultwiredtoglobal, setloggerswap, printflnglobal,
silentwritesnothing, silentignoresprintfln — defaultwiredtoglobal
still precedes every log.setlogger caller (setloggerswap and
printflnglobal, both later in its own file; funcs and silent rows
never call setlogger).

Consumers: Makefile LIBRARY_TESTS replaces the log_test.ww entry with
the two new entries in place; test/byteid/libbyteid_test.ww roster row
becomes two fx rows, NENTEXPECT 59->60.

Validation: standalone ww test lib/log/funcs_test.ww (6 passed) and
lib/log/global_test.ww (3 passed); dir mode ww test lib/log (11
passed, no duplicate symbols); byteid compile-only build exit 0, 60
roster appends == NENTEXPECT.

Makefile

@@ -496,7 +496,8 @@ LIBRARY_TESTS = lib/errors/errno_test.ww lib/ascii/ascii_test.ww \
 	  lib/bufio/stream_test.ww lib/bufio/scanner_test.ww \
 	  lib/math/random/random_test.ww \
 	  lib/math/checked/checked_test.ww lib/fmt/fmt_test.ww \
-	  lib/log/log_test.ww lib/log/silent_test.ww lib/fnmatch/fnmatch_test.ww \
+	  lib/log/funcs_test.ww lib/log/global_test.ww \
+	  lib/log/silent_test.ww lib/fnmatch/fnmatch_test.ww \
 	  lib/shlex/shlex_test.ww lib/time/arithm_test.ww \
 	  lib/time/duration_test.ww lib/time/instant_test.ww \
 	  lib/encoding/hex/hex_test.ww lib/memio/memio_test.ww \