Tune slideshow timing and title overlays

AGENTS.md

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+# Project context for movmaker
+
+## Notes
+- This project will be a simple Python + ffmpeg movie maker.
+- Desired workflow: user dumps all files into one flat input directory and runs a script; no manual YAML and no required subdirectories.
+- Script should auto-detect images, videos, audio files, and an optional simple text data file for titles/dates/places. Default/simple data file content applies generally to the whole movie; optional per-file entries may be supported but must not be required.
+
+## Guidelines
+- Do not store sensitive secrets, passwords, API keys, or private credentials here.
+- Never push changes to git unless explicitly asked.