Remove the experimental Windows 7 build

Drop the unsupported Windows 7 x64 portable build and everything that existed only for it:
the windows7 workflow, packaging script and docs/windows7.md; the windows7 feature and the
win7-target cfgs (plain cfg(windows) now); the Windows 7 print transport
(printing/windows7.rs); the glow renderer path; and vendor/windows-link, the patched crate
only that build used. NOTICE, README and the living docs no longer describe it; dated
change-history rows are left as they were.

docs/roadmap.md

@@ -101,7 +101,7 @@ Checked 2026-10-10 from the code, tests and open issues; no workflow fails, so V
 | M12 | Advanced color & art (CMYK/ICC, separations, Gradient Mesh, Live Paint, Image Trace, Graphs) | 🟡 Gradient Mesh, Live Paint, Image Trace (junction-returning pieces retain their positioned boundaries; a simpler contour walk with identical output; an edge's sub-pixel shift is the same from either side; notches read only their own piece; collapsed loops keep few segments; large images trace with a warning; Auto Color keeps rare distinct colours; quick presets trace at once and the Image Trace button opens the adjustment controls; Properties reopens them; tiny fitted contours retain islands and holes; Create Strokes: exact crop EDT, Guo–Hall thinning and maximal-disc graph simplification; 15 presets, the 14 documented ones each with an enhanced version; Ignore Color, Shapes, Auto Grouping and Gradients options; measured in `image-trace-quality.md`; closed outlines retain their interior after straightening; the Flat Logo mode places edges to a fraction of a pixel, restores sharp corners, snaps lines and circles, and refuses gradients; live trace result bounds and selection highlights exclude the retained bitmap except in source-image views), Recolor Artwork, colour management (ICC, soft proofing, separations preview), Graphs (all 9 tools, Graph Data/Type, group-selected series colours persist through regenerate/save/open) done; Graph Design and Marker designs, Transpose and Switch x/y, `\|` label line breaks, the pie options, drop shadows, the legend across the top, overlapping widths, First Row/Column in Front, filled lines, kept label formatting and the Graph Data worksheet done; graph Column designs pending | 6–10 |
 | M13 | Automation (Actions ✅ record/playback, persisted; variables, scripting, batch) | 🟡 MCP `add_text` exposes existing vertical point, area and path type; broader scripting and batch work remains | 18–27 |
 | M13 | Automation (Actions ✅ record/playback, persisted; variables, scripting, batch) | 🟡 | 18–27 |
-| M14 | 1.0 polish (preferences, shortcut editor, workspaces, accessibility, packaging for all OSes) (status messages and readouts use stable responsive allocations sized for localized labels and ordinary coordinates; sample widths cached by language/unit/DPI; regression-tested and contributor-confirmed 2026-10-19; estimates unchanged) | 🟡 Dock groups collapse to their tabs by a double-click on a tab (UI.8); Preferences › General › Constrain Angle acts for the arrow keys, Shift drags and new objects (#394, 2026-10-21); numeric-field pointer selection and focus regression-tested (#1326, in part; short movements still select all); RPM runtime capabilities and glibc floor checked (#1275; real-distro install/start-up pending), Eyedropper cursor with precise-setting checks (#1269), Preferences, shortcut editor (chords with Shift and a punctuation key fire as typed; other apps' text shortcut sets imported), workspaces (each keeps its layout changes until Reset <name>, UI.7), panels docked by dragging into any dock group (as tabs or a top/bottom split) or into the icon column, and closed from a dock tab's context menu (UI.6), a custom title bar on Windows/Linux with a Home button, content-sized dialogs, menus that scroll when longer than the window and macOS native menu dismissal done (M14.8), and native macOS save sheets with a Format menu (#866); an experimental, unsupported Windows 7 x64 portable OpenGL build (not verified by maintainers); titled PDF exports set `DisplayDocTitle` for viewers and accessibility checkers (#3646); accessibility and broader Windows/Linux packaging/QA pending | 18–28 |
+| M14 | 1.0 polish (preferences, shortcut editor, workspaces, accessibility, packaging for all OSes) (status messages and readouts use stable responsive allocations sized for localized labels and ordinary coordinates; sample widths cached by language/unit/DPI; regression-tested and contributor-confirmed 2026-10-19; estimates unchanged) | 🟡 Dock groups collapse to their tabs by a double-click on a tab (UI.8); Preferences › General › Constrain Angle acts for the arrow keys, Shift drags and new objects (#394, 2026-10-21); numeric-field pointer selection and focus regression-tested (#1326, in part; short movements still select all); RPM runtime capabilities and glibc floor checked (#1275; real-distro install/start-up pending), Eyedropper cursor with precise-setting checks (#1269), Preferences, shortcut editor (chords with Shift and a punctuation key fire as typed; other apps' text shortcut sets imported), workspaces (each keeps its layout changes until Reset <name>, UI.7), panels docked by dragging into any dock group (as tabs or a top/bottom split) or into the icon column, and closed from a dock tab's context menu (UI.6), a custom title bar on Windows/Linux with a Home button, content-sized dialogs, menus that scroll when longer than the window and macOS native menu dismissal done (M14.8), and native macOS save sheets with a Format menu (#866); titled PDF exports set `DisplayDocTitle` for viewers and accessibility checkers (#3646); accessibility and broader Windows/Linux packaging/QA pending | 18–28 |
 | — | Interaction fidelity pass (every tool's modifiers, Properties panel per context, isolation, nuance; width-point creation and adjoining adjustment regression-tested; dialog layout reviewed) | ⬜ (new ruler-guide Alt orientation implemented; existing-guide Escape cancellation regression-tested; broader pass remains) | 60–90 |
 | — | Hardening at scale (big-file corpus, fuzzing, cross-platform + browser QA) | 🟡 PngSuite integrity and bounded fetching verified (#1729); real-world corpus/manual QA remain | 50–80 |
 | M14 follow-up | Color Picker layout (#2008) | ✅ Compact controls, centered header, stacked actions, aligned fields and screen sampling; narrow windows scroll vertically | Included above |