[ntindle]

Dividers in bins (F18): one center divider in every generated bin STL

Bin options gains a "Dividers in bins" switch. When on, every generated bin STL gains one center divider down the middle of its long side (square bins: along x), 1.2 mm thick, from the bin floor up to the top of the bin units, below the stacking lip so bins still stack. Persisted as gridfinity_dividers, local-only (not in share links, same precedent as label tabs and test fit). Estimates include the divider volume; the Download files README notes it. The divider changes neither part height nor footprint, so 3MF plate packing and the printer-Z limit are untouched.

Feature map: F18 ❌→🟡 (one fixed divider, not configurable counts or positions), parity 49.0% → 50.0% (23 ✅ + 4 🟡 / 50). F15 cell wording updated (dividers no longer in its missing list).

Evidence

• Local gates on the branch commit: npm test 51 files, 603 passed / 11 skipped; npm run lint clean; npx tsc --noEmit clean; npm run build green (index chunk 236,207 → 237,001 B, +0.3%; lazy export chunk 22,147 → 22,830 B, +3.1%).
• Mesh: divider box stays inside the bin footprint (bounds unchanged, 0..83.5 for a 2×1 bin), top at height×7 mm below the stacking lip; closed/outward-facing in all tested shapes; mesh volume equals analytic volume to 1e-6, with the orientation test pinning divider corners (not wall vertices) for both along-x and along-y bins.
• Perf vs trunk, same box/day, node scripts/measure.mjs --n=15 --lh=3 × 2 pairs (branch then trunk; trunk then branch): branch LH 73/71, TTI 3630/3772 ms, input-to-preview 62.5/43.7 ms, layout 562/515 ms, share 113/93 ms; trunk LH 72/65, TTI 3696/4127 ms, input-to-preview 38.4/47.2 ms, layout 558/509 ms, share 91/90 ms. Verdict: no credible regression — pair 1's interaction gaps did not reproduce in the reversed pair, and trunk's own swing exceeds every branch–trunk gap. The diff touches no measured code path.
• Independent review: SHIP IT on the code (commit 093541a), then SHIP IT on the docs-only amend (scoreboard section + F18 tie-break wording) that produced the final head. Non-blocking nits recorded in the goal backlog: square-bin tie-break wording (closed in this PR), divider/wall fuse overlap convention (same as tabs), a dead settings helper that does not expose dividers, and no standalone partVolume-with-divider unit test (covered transitively).
• Trunk expectations for Lane B (deploy preview): core tasks 1–3 pass as on trunk; the "Dividers in bins" switch is present in Bin options with the stated description; OFF persists across reload; with a placed bin, turning it ON raises the Print plan estimate line by exactly the divider volume and leaves plate rows/counts unchanged; ON persists across reload; Download files still succeeds.

Scoreboard

docs/scoreboard.md updated with the 2026-10-30 section (parity 50.0%, both perf pairs, bundle delta).

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[github-actions]

PR Quality Report 📊

Check	Status
TypeScript	✅
ESLint	✅
Tests	✅
Build	✅

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[codecov]

Codecov Report

❌ Patch coverage is 97.43590% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@1b6e799). Learn more about missing BASE report.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/utils/partVolumes.ts	87.50%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #159   +/-   ##
=======================================
  Coverage        ?   93.99%           
=======================================
  Files           ?       71           
  Lines           ?     3644           
  Branches        ?     1067           
=======================================
  Hits            ?     3425           
  Misses          ?      198           
  Partials        ?       21           

Flag	Coverage Δ
unittests	93.99% <97.43%> (?)

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