refactor(core): share WASM cell-kind wire tags

[chh-ay]

Summary

• define the TypeScript WASM cell-kind wire tags in one dependency-free internal module
• migrate the store, visible-window reader, and paint worker without changing encodings or branches
• exercise the real WASM-to-TypeScript window contract and enforce the new leaf in the import-ownership gate

Verification

• bun test packages/core/test/wire-tags.test.ts — 1 pass
• bun test packages/core/test — 753 pass
• bun run lint — pass (one existing corpus-size warning)
• bun run typecheck — pass
• cd packages/wasm && cargo check --target wasm32-unknown-unknown — pass
• bun scripts/check-import-cycles.ts — 88 modules acyclic
• bun run api:check — pass; baseline unchanged
• bun run changeset:ci — pass
• structural searches — KIND_* declarations only in store/wire-tags.ts; string decode sentinel uses shared NO_STRING; both cache caps remain independent
• bun test — 1267 pass, 7 unrelated base failures: one stale docs compatibility inventory expectation and six benchmark-artifact checks whose recorded TypeScript 7.0.2 differs from the locked 6.0.3 compiler

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Project	Deployment	Actions	Updated (UTC)
sheetwrite	Ready	Preview, Comment	Jul 26, 2026 3:51pm