Harden runtime boundaries and ship capability showcases

[chh-ay]

Summary

• bound collaboration, snapshot, XLSX, and paging resource paths
• replace the XLSX codec with an optional bounded implementation and producer fixtures
• improve cache ownership, canvas behavior, documentation contracts, and browser portability
• ship capability, database, collaboration, interoperability, and performance showcases

Verification

• full TypeScript and Rust coverage gates
• package typecheck, lint, cycle, dependency, and release-policy checks
• Chromium and Firefox suites; WebKit portability in the pinned Playwright container
• canonical tarball, packed consumer, bundler, size, benchmark, and release verification

[vercel]

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Project	Deployment	Actions	Updated (UTC)
sheetwrite	Ready	Preview, Comment	Jul 19, 2026 9:41am