Merge pull request #1850 from dotCooCoo/chore/docs-perf-and-gaps-facts

Docs: G15 and the parity doc cite budget runs and slowness reports since 2026-10-11
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@ -218,8 +218,9 @@ from G14 and the budget run of G15: **~170–270 h** one agent, ~50–80 h wall
## G15 Performance budgets and a GPU renderer
- **Improved (#1257):** Craquelure, Mosaic Tiles and Stained Glass reuse squared distances during nearest-cell searches, with the original distance ordering retained near rounding/tie boundaries. A brute-force boundary regression and full-viewport pixel comparisons agree with the old result. `texture_drag_perf` reproduces a moved CMYK rounded rectangle at 190.07% and DPI 1.5; timings from a busy development machine are supporting evidence, with idle Windows drag QA still pending.
- **Missing:** an idle-machine run of `vectorcraft-cli perf` at 50k paths (last: 2026-10-11 at 25k paths, every
budget met, 400% zoom 12.3 ms against 16 ms, measured), a spatial index for zoomed-in frames, dirty-region
- **Missing:** an idle-machine run of `vectorcraft-cli perf` at 50k paths (2026-10-11 at 25k paths, every budget
met, 400% zoom 12.3 ms against 16 ms, measured; runs of 0.10.0 on Linux with 4 logical CPUs, reported in #1172
on 2026-10-13, missed all three render budgets at 20k paths), a spatial index for zoomed-in frames, dirty-region
rendering, the GPU backend spike (M5). Large-selection edits, cached live effects and Pathfinder Trim, Merge,
Crop and Outline landed in #1173.
- **Not redrawn:** the canvas keeps drawing these objects as they were:

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@ -168,9 +168,11 @@ The discounts, with the evidence:
- **Stability on real machines (×0.92).** The code never panics by design, and the main platform (macOS) starts
reliably, but 26 issues mention a crash, freeze or failed launch (8 open: #858, #964 fixed the day of this
review, #620, #818, #905 on Windows 7, #834). There is no field record and no real-world file corpus yet.
- **Performance unverified.** Budgets (`vectorcraft-cli perf`) haven't been run on an idle machine since
2026-10-01; the last loaded run missed the 16 ms frame budget at 50k paths. Not discounted separately: no
user has reported slowness in mainstream work beyond #575 (Linux AppImage) and #758 (`.ai` open time).
- **Performance unverified.** Budgets (`vectorcraft-cli perf`) were all met at 25k paths on 2026-10-11; runs of
0.10.0 on Linux with 4 logical CPUs, reported in #1172 on 2026-10-13, missed all three render budgets at 20k
paths. Performance is not discounted separately. Open user reports of slowness in mainstream work include #575
(Linux AppImage), #758 (`.ai` open time), #1097 (zoom and pan in 0.9.0) and #1731 (a drag that stutters as it
starts).
- **Missing subsystems** a minority need daily (3D, the Effect Gallery, CJK vertical composition, scripting)
pull the full number below the mainstream one.