G2: improve editing reliability and Windows rendering fidelity

docs/gaps.md

@@ -31,7 +31,7 @@ of them have been reconciled.
 | Dimension | Estimate | Evidence |
 |---|---|---|
 | Breadth of features | ≈ 95%+ | All 306 effects, the After Effects menus and panels, Classic and Advanced 3D, tracking, expressions, scripting, render queue (parity.md) |
-| Behaves like After Effects | unmeasured, ≈ 60–80% | One outside contributor found four bugs in features marked done within a day (PRs #6–#10): Hold keyframes eased the motion into them, `keyInSpatialTangent` / `keyOutSpatialTangent` had the wrong names, a zero frame rate crashed, Find and Enter Full Screen shared Ctrl+F off macOS. There are about 10 After Effects reference captures in total. No test compares our renders or property values with After Effects itself; the tests check what the agents believed After Effects does |
+| Behaves like After Effects | largely unmeasured, ≈ 60–80% | One outside contributor found four bugs in features marked done within a day (PRs #6–#10): Hold keyframes eased the motion into them, `keyInSpatialTangent` / `keyOutSpatialTangent` had the wrong names, a zero frame rate crashed, Find and Enter Full Screen shared Ctrl+F off macOS. There are about 10 After Effects reference captures in total. The first live G1 comparison now checks eight scalar Rotation/ease cases (168 samples) against AE 26.3x87 via AEsync 2.0.4: all pass after fixing overlapping temporal influences, with maximum error below 3e-11 degrees ([scores and reproduction](fidelity/README.md)). Other animation behavior and rendered frames remain unmeasured |
 | Opening existing After Effects work | ≈ 0% | `.aep` / `.aepx` projects cannot be opened. Third-party After Effects plug-ins cannot run. Expressions and the scripting object model are strong, so scripts and expressions carry over |
 | Stability | improving | 23 never-crash PRs landed on 4 October; [AGENTS.md](../AGENTS.md) "Never crash" now binds every crate. On 5 October `cargo xtask ci` failed on main under Rust 1.99's clippy (a fix is in progress) |
 | Real-user experience | ≈ 70%, uneven by platform | Issues #41–#47 (all from the Linux AppImage 0.1.1, 5 October): panning the viewer snaps back, panels can't be resized or rearranged, drag-and-drop and double-click import don't work, layer rename gets stuck, the Layer Settings arrow does nothing, the Project panel clips, the Wayland window icon is generic. Issues #63–#68 (macOS, 5 October): scaling a layer by its handles goes wrong and can stick at 0, two 3D compasses, the viewer lags while a layer is dragged (a frame renders in 20 ms but showed after ≈ 100 ms, behind RAM preview prefetch), the Discord and other links do nothing, Delete doesn't delete in the Project panel, hidden layers can be selected in the viewer. All but the last two were fixed or confirmed fixed with a test on 5–6 October (those two have community PRs); file drops still can't work on Wayland (winit has no support). The panning, rename and arrow bugs had been fixed in v0.2.0 already; nobody had told the reporter. Most checking happens on macOS. No localisation, no accessibility work |