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refactor: fold bb_config_staged into bb_config as a second TU (#849)

bb_config_staged never met the new_component distinct-dependency bar --
its deps (bb_config bb_storage bb_core) are a strict superset of
bb_config's own, and the txn vtable it wraps already lives inside
bb_storage. Relocate its header/source into bb_config (git mv, history
preserved), drop the standalone component dir, and update
bbtool.toml/bb_settings' CMakeLists accordingly. bb_config's REQUIRES
stays bb_storage bb_core -- no new dependency, confirming the split
was unwarranted. Symbols/API/tests unchanged; pure relocation.

Two comment sites in bb_config_staged.h were reworded for the collapse
(the top @brief block, and a mid-file capacity note that said "this
component's own" -> "this sub-namespace's own"); no contract prose
changed.

components/bb_config/README.md's Public API section is converted to
the marker-based bbtool:api region (already the established pattern
for multi-header components, e.g. bb_core) so it now enumerates both
bb_config.h and bb_config_staged.h instead of silently dropping the
latter's docs; Config knobs gains a line on the staged sub-namespace
borrowing bb_storage's txn caps.

fence --update-baseline prunes only the removed bb_config_staged
new_component marker (shrink-only, 5-line diff, nothing added).

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