refactor: enforce internal export boundaries

[chh-ay]

Summary

• Remove implementation-only export modifiers across core and XLSX after symbol-aware reference checks.
• Add a pinned Knip package-workspace gate to api:check; public entry files stay excluded and test consumers are included.
• Refresh generated API source locations and ownership contracts without changing the supported public symbol set.
• Replace the five-year-old Cargo profile comment with the v0.4.0 interleaved formula/size result.

Verification

• bun run api:check — passed, including the new internal unused-export gate.
• bun run typecheck:packages — all six package workspaces passed.
• bun test packages/core/test packages/xlsx/test — 854 passed, 6 skipped, 0 failed.
• bun run docs:check — passed.
• bun run lint — passed with only the existing oversized conformance-corpus warning.
• bun run build:packages — all package builds passed.
• bun run changeset:status — core/WASM minor; remaining publishable workspaces patch; no major bump.

Release tracker

This resolves the two maintainability checkboxes and the stale Cargo.toml rationale in #33. The six-cell WASM build matrix remains open: exploratory size builds completed, but the unchanged canonical bench:formula gate failed four clean attempts on different p95/median cells, so no post-link profile decision is claimed and no threshold is weakened.

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Project	Deployment	Actions	Updated (UTC)
sheetwrite	Ready	Preview	Aug 11, 2026 10:35am