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fix: type bb_serialize's format-registry parse slot, add JSON composed adapter (#950)

Retypes bb_serialize_format_entry_t.parse from an opaque `const void *`
to a typed bb_serialize_parse_fn, closing the parse-contract collision
where every format backend cast a different signature into the same
untyped slot. bb_serialize_json now registers a real composed adapter
(bb_serialize_json_parse_bytes, scan_bounded -> tok recorder ->
populate_from_tok via bb_mem_arena-carved scratch) instead of casting
its scan_bounded() entry point directly into the slot.

Adds bb_mem_arena_alloc_rest() -- an alignment-safe "claim whatever's
left" bump-allocator primitive that rounds its claimed size DOWN to
_Alignof(max_align_t) rather than rounding a caller's exact-free-bytes
request UP past the true remainder. The parse adapter uses it to carve
its escape-decode arena from leftover scratch; the naive
bb_mem_arena_alloc(a, bb_mem_arena_free_bytes(a)) form it replaces
spuriously failed the whole parse whenever scratch_cap left a
non-alignment-clean remainder.


Claude-Session: https://claude.ai/code/session_01VA9XvWjJcbAUGCZpSFfp3H

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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