fix: correct four wrong behaviors and drop three dead code pathsHEADmain

- yt-dlp downloads claimed completion when tsp had merely queued them.
- A fresh machine opened org links in EWW, not Chrome.
- ArchWiki search raised a raw error instead of the install hint.
- The pre-commit hook kept running when its cd failed.
- Removed a second device-grouping implementation nothing called.
- Removed a redundant epub advice that ran on every file visit.
- Removed a buffer-burying clause naming a mode Emacs doesn't define.
- Moved the Hugo bindings onto the custom prefix map.
- The ArchWiki docs path is now a variable, making it testable.

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