Showcase the day-to-night transition and exposure fusion in the README

[ekstremedia]

Gives the README a front-page showcase built from the production Spjutvika camera:

• A day-to-night GIF (960x540, 37 frames, one per ~12.5 real minutes from 18:06 to 01:23) where the overlay's exposure readout ramps smoothly from a 315 us daylight shutter to 8.4-second night exposures, ending held on the night peak.
• A link to the full timelapse on YouTube, starting at the sunset, and a link to the live cameras.
• An exposure fusion section: single-exposure vs fusion + tone mapping framegrabs side by side, with an explanation of the Mertens fusion bracket, the CLAHE tone-map pass, and the spread narrowing to zero toward night so the transition stays flicker-free.
• A sharper title and intro: automated timelapses, plus the scripts that render finished deflickered FFmpeg videos.

Note: the fusion feature documented here lives on main (raspilapse/dynrange); this branch predates that merge, so the section applies cleanly once merged.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between a5f3ab9 and 6db6a6c.

⛔ Files ignored due to path filters (3)

• demo_images/day_to_night_01.gif is excluded by !**/*.gif
• demo_images/fusion_tm_spjutvika-01-framegrab-day-2026-08-10-00_00_00.jpg is excluded by !**/*.jpg
• demo_images/spjutvika-01-framegrab-day-2026-08-05-00_00_00.jpg is excluded by !**/*.jpg

📒 Files selected for processing (3)

• README.md
• UpgradeOldRaspilapse.md
• newcam.md

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