[01/06] feat(core): add bounded functions exec foundations - #3
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USER LIVE-GATE FIX #4, research half: does LOK paint an infinite grid past a spreadsheet's used range, the way Excel/Calc's own UI does? Answered empirically against our real vendored LOK pin, not assumed — OfficeHelperLiveTests.testGateXlsxTilesPastTheUsedRangeEmpiricalInfinite GridProbe requests gate.xlsx tiles at the used-range edge and ~20 tiles beyond it: both come back as a clean, gridded, non-blank canvas (PNG dump), unchanged all the way out. paintPartTile genuinely renders empty cells there; nothing needed faking client-side. Implementation: OfficeTileCanvasView.effectiveExtentTwips extends the scrollable bound by 2 extra screens per axis, for spreadsheets only (isSpreadsheet, read once from the open document's type — presentations/ documents have real fixed page bounds and were never probed for this). One computed property feeds BOTH the scroll clamp (clampedOriginX/Y) and performSubscribe's churn-audit skip-check (officeClampViewportToDocumentExtent's call site) so they cannot disagree — the trap being guarded against: if scrolling reached further than the skip-check's own clamp, the margin would be scrollable but its tiles would never actually get requested (placeholders forever, just moved past the new margin instead of past sizeTwips). That widened skip-check interacts with fix #3's whole-document residency sweep at a small, fully-resident spreadsheet's own edge: the fixed subscribeMarginPoints overscan now genuinely touches real, never- prefetched margin tiles, so a resident document's post-fill scroll near its edge now costs exactly one further subscribe (a one-time margin warm), not the prior zero. testResidentDocumentIsPrefetchedWholeIn... NoFurtherRequests is amended (not weakened) into a two-phase pin proving exactly that: one warm, then genuine silence once the touched slice is also cached — the "no chatter for zero benefit" invariant's spirit holds, only its letter moved.
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First PR in the ordered functions.exec stack. Adds private, cross-platform protocol, NDJSON framing, retention, and worker-helper foundations only. No tool registration, daemon, engine, provider, persistence, or client surface is changed.
Verification:
Full Core TypeScript still has six pre-existing approvals.test.ts diagnostics; nested Seatbelt workflow execution is blocked by the enclosing host sandbox.