Adds 5 pure-function tests in a new test_repl_resource_formatting.c
for repl_is_bytes_valued_resource()/repl_format_bytes_human()
(classification, adaptive B/KB/MB/GB/TB/PB scaling including exact
boundary values, swp's MB->bytes conversion), and 3 tests in
test_repl_snapshot_params.c for set units raw|human|both parsing
(Requirements 6.1-6.3). All fail as expected: link failure for the
not-yet-existing helpers, compile failure for the not-yet-existing
units_mode field/enum.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YAWMhfRJFnmmnG8h97yUDd
