Addresses the first codex review of the binary `.fig` parser.
BLOCKs:
- kiwi: 64-bit varint now uses Kiwi's terminal-byte rule (eight
7-bit groups then a final full-8-bit byte) — the old `& 127` mask
on every byte corrupted u64 values above 2^56.
- kiwi: an invalid schema definition kind (> 2) is now rejected
instead of silently treated as a message.
- kiwi: array decode rejects a length exceeding the buffer size —
guards against a hostile zero-byte-element array spinning the
decode loop billions of times.
- zip_reader: aggregate 2 GiB decompression budget + 10k entry cap
on top of the existing per-entry limit (zip-bomb defence).
CONCERNs:
- detect_kind now recognises the `PK\x03\x04` ZIP magic as Binary —
the common Figma export form (`canvas.fig` + `images/` in a ZIP)
was being rejected before container.rs could unwrap it.
- resolve_style_references now also resolves style refs inside
instance `symbolData.symbolOverrides` entries.
- kiwi: enum field type codes are no longer resolved (unused; kiwi
writes 0) so a stray code can't reject a valid schema.
Plus a zip-wrapped end-to-end test + the misleading zstd test rename.
op-figma 84 tests green (+1); clean build.
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