v0.7.3

• Windows setup r25 asks before a new VICE installation; declining offers an existing path or manual installation later and explains the effect on running/tests and cartridge builds. Clarify the native Python build command and direct use of prebuilt cartridges.
• Add independent foreground, background and border selection to object and authored-scene builds, including resident PRGs and streamed cartridges. Keep --color compatible and add --foreground-color, --background-color and --border-color with documented aliases.
• Accept native colour names, decimal/hex/binary palette indices, RGB hex and rgb(...); map RGB inputs to the fixed C64 palette on the host. Apply the same parsing to SVG foreground selection, Blender c643d_color properties and the autotuner's --color-index.
• Preserve the selected background in initial screen RAM, per-frame source-colour spans and recycled buffers. Restore selected VIC registers after an authored intro. Monochrome inversion changes screen colours without changing geometry.
• Add optional foreground/background/border defaults in config/c643d.ini.
• Add color-combo-test: four preserved classic animations, automatic ten-second PAL playback per entry, immediate repeat, F3 foreground cycling and F4 background cycling. Only this tester couples the border to the background. SPACE skips; F1 returns to its menu.
• Add F3/F4 monochrome foreground/background, F7 independent border and F8 preset reset during playback in Demo Cart 1 (FPS/RAM) and Demo Cart 2.0. Preserve the menu's F4 HiFi shortcut and F5 exhibition mode. Multicolour entries retain their source palette and support border cycling/reset.
• Reuse the existing IRQ keyboard scan with equal idle CPU cost; no drawing-loop polling or per-frame colour conversion is added. Controls occupy an unused vector-dispatch page in the direct-only v2 integration. --no-color-controls produces a build without these controls.
• Include prebuilt test/demo cartridges, reproducible builders, pixel/border/timing/keyboard verifiers and the colour guide. Other 0.7.2 example cartridges retain their bytes and build identities.
• Finalize after user acceptance. PAL VICE regression matches all 93 old/new timing windows exactly; idle keyboard polling remains 82 cycles. All 26 canonical renderer comparison jobs pass. See release notes and validation evidence.