Integrate and qualify the pending rendering, text and platform work

[wieslawsoltes]

This integrates the pending rendering, text, platform and source-adapter work through #359 while preserving all 84 original PR heads. The combined changes repair native transport and compilation, retained shader sampling and opacity, Direct2D clips and Clear, physical path/glyph coverage, font ownership and placement, and native window/input lifetimes.

Published head: 3a95a19e7e6d245dfc7e4e83948eeb316353c5ec. The whole Build has passed all 59 jobs, including all six native producers, native NuGet packaging, independent graphics oracles and original Windows ARM64 DX12 JIT/NativeAOT consumers. All 12 companion workflows passed on this exact head. Both downstream integration pins are now published; coordinated consumer CI is running.

Rendering behavior

Original physical glyph coverage and bounded physical source paths retain their independent Microsoft references. Both physical M3 native Metal providers match all 278 original glyph captures exactly, cold and warm, with zero warm vertex/index/coverage uploads. Independent line/curve controls retain their own reference pixels. The tests distinguish original DrawGlyphRun coverage from FillGeometry: independent/prepared geometry pairs agree, while glyphs are compared with their unchanged original glyph images.

Native signed winding uses a separate lazy pipeline only after validation proves the complete original segment inventory contains lines. Both native providers and retained clips use this gate. Any curve or unknown kind, including an unused one, rejects the raw specialized entry before writing. The shared final predicate preserves even Nonzero winding magnitudes; the original Microsoft WPF oracle independently confirms clockwise/counterclockwise contours and cancellation.

The ordinary line shader now selects exact bounded integer or original floating crossings after the unchanged complete range/lattice admission. This removes the per-line admission early-return shape that crashes ARM64 D3D12/DXC WARP. Candidate integer arithmetic is bounded without altering source coordinates or admitting off-grid samples. All eight sample lanes, half-open endpoints, winding, curves, Boolean programs, workgroups, buffer ownership, submissions and compiler/adapter defaults remain intact. The canonical shader supplies managed rendering and both native providers.

The package DrawingImage fixture supplies its actual shader-receiver bounds and explicit physical frame and rejects either missing input. All ownership assertions remain. Release native production now prepares and stages the same exact signed font and pinned ICU dependencies as Build on all six RIDs, with original notices. CMake SDK installation copies the original ICU archive unchanged so Apple ranlib cannot invalidate the strict receipt.

Validation

• Final source: 6,137 managed renderer tests pass, with nine platform skips; all 278 headless tests and all 49 macOS native tests pass. Both native providers retain the 14 original/reversed rational line fixtures on cold/warm frames.
• Original seven-uniform MIL GPU capture: repaired DXC matches all 174,080 unchanged FXC reference bytes. Forty additional sampling/phase/independent-axis mappings match all 6,963,200 bytes across original FXC, repaired FXC and repaired DXC.
• Local ARM64 D3D12/DXC Basic Render Driver: the retained MIL source consumer completes the original scene, ownership, participation and query assertions with exit zero. This dependency-free diagnostic omits only the unrelated optional inline-font preflight and does not qualify packages.
• Final exact Build 3a95a19e7: 59/59 jobs passed. The original ARM64 DX12 package JIT/NativeAOT job passed all retained scene/resource/ownership/query checks. The macOS ARM64 sample's original 60-second timeout passed on one unchanged retry (47.26 seconds); no source, input or timeout changed. All 12 companion workflows also passed.
• Earlier full local dependency qualification: all 13 NativeAOT consumer scenarios, 39 font and 19 ICU admission controls, and the actual installed C++ SDK consumer pass. All 31 release Bash blocks parse.

Release boundaries

The owner-approved Intel exception in #363 is limited to the diagnosed original red-byte UNORM conversion and independently verified half-opacity/recorder consequence. Original reference captures, complete source guards, both windings, cold/warm identity and every other pixel/channel remain exact. It does not waive this DX12 failure or any producer, package or application gate.

Legacy RaymarchingPrimitives/StarNest presets are removed from the current tree under the owner's explicit exception preserving published history; #362 tracks historical cleanup. Runtime and Avalonia versions are aligned for preview.66. Remaining Display text, shader/cache, mapped-picture and native popup/input admission and application work stays explicit in #361. Windows evidence is in #364.

Downstream integrations: wieslawsoltes/LibreWinForms#159 and wieslawsoltes/LibreWPF#258. They may consume only native artifacts from the whole successful exact producer. Qualified dependency pins are published in both integrations. Default-branch merge and release are next after their native staging steps complete.

Research and ownership boundaries use primary public contracts; no foreign implementation was imported.

Supersedes these 84 draft PRs, whose latest remote heads were checked as ancestors before consolidation: #263, #264, #265, #266, #267, #268, #269, #271, #272, #273, #274, #275, #276, #277, #278, #279, #280, #281, #282, #283, #284, #285, #286, #287, #288, #289, #290, #291, #292, #293, #294, #295, #296, #298, #299, #302, #303, #304, #305, #306, #316, #317, #318, #319, #320, #321, #322, #323, #324, #325, #326, #327, #328, #329, #330, #331, #332, #333, #334, #335, #336, #337, #338, #339, #340, #341, #342, #343, #344, #345, #346, #347, #348, #349, #350, #351, #352, #353, #354, #355, #356, #357, #358, #359. Closing them consolidates tracking; it does not mark the work merged or fully qualified.