C-319: port the incumbent's shared-cell capture contract — its copy minted a colliding C-302

[O6lvl4]

Repairs today's contract-id collision. The incumbent develop's ledger COPY minted C-302 (cb7c00ee4, "shared-cell captures") on the same day this repository's canonical ledger assigned C-302 to the numeric-determinism family head (#35). Contract ids are permanent and global; the judge's ledger is canonical (BOUNDARY.md; the copies await develop's Stage B cutover).

• The behaviour lands HERE as C-319 (next free id), statement verbatim plus a provenance note; fixture spec/wasm_cross/closure_captured_list_mutation.almd ported with the id rewritten and the port noted in the header.
• Against 0.58.0 the fixture diverges exactly as the contract says the pre-admission bug did (since = 0.59.0, requirements-first in the provenance ledger — 20 now).
• The incumbent side is asked (almide/almide issue) to rename its C-302 → C-319 in its copy and fixture header before any further ids are minted there; ids C-320+ are next-free in this ledger, and the durable fix is its cutover (copies deleted, contracts landed here first).

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