feat(SOLSYS-42): Blender Earth/Moon intro on Sol→α Cen cinematic

[ThomasAFink]

Summary

• Opens sol_centauri_cinematic_{light,dark}.gif with Blender Earth → Moon close-ups, then the existing matplotlib tour
• New animate/gif_compose.py (Pillow for tests/small GIFs; ffmpeg for large product GIFs)
• Missing flyby assets are skipped so render.py animate --system sol_centauri still works without Blender
• Regenerated spliced gallery GIFs

Closes #42

Test plan

• python -m unittest tests.test_gif_compose tests.test_sol_centauri_cinematic -v
• ruff check / format
• Splice onto existing cinematics with Earth/Moon flyby GIFs present
• Spot-check open of light/dark cinematic GIFs (Earth, then Moon, then tour)

Please review before merge — will not merge until you say so.

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📥 Commits

Reviewing files that changed from the base of the PR and between 2d2f5ab and 999a336.

⛔ Files ignored due to path filters (2)

• output/animate/sol_centauri/sol_centauri_cinematic_dark.gif is excluded by !**/*.gif
• output/animate/sol_centauri/sol_centauri_cinematic_light.gif is excluded by !**/*.gif

📒 Files selected for processing (4)

• README.md
• animate/gif_compose.py
• animate/scenes/sol_centauri_cinematic.py
• tests/test_gif_compose.py

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[ThomasAFink]

Reverting #42 branch to main — starting over; post-hoc GIF splice was the wrong approach.