Capture this laptop's Omarchy customizations

Everything on top of a stock Omarchy 4.0.4-1 install, gathered so a second
machine can be brought to the same state: the ~/.config files that actually
differ from the shipped defaults, the three hand-built themes, the ten shell
plugins pinned to commits, the two custom scripts, two user units, and the
/etc drop-ins.

install.sh applies it all idempotently, backing up anything it overwrites.
capture.sh runs the other way so the repo stays the source of truth rather
than a snapshot that rots.

indie.herdr-hud's ten local-only commits ship as a git bundle plus a
working-tree patch, since they stay off the upstream PR deliberately.

Secrets, the dotfiles repo's territory (shell/git/mise), the remote-access
stack and aether-managed themes are all scoped out; README says why for each.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

themes/porsche/CREDITS.md

@@ -0,0 +1,6 @@
+Backgrounds from Wikimedia Commons:
+1-rainy-evening.jpg  "Porsche 911 on a rainy evening (Unsplash)" — CC0
+2-gulf-917.jpg       "Gulf Porsche 917" — CC BY 2.0
+3-night.jpg          "Porsche Porsche at night (8169422529)" — CC BY-SA 2.0
+4-carrera-rs.jpg     "Porsche 911 Carrera RS, Bj. 1972-73 (2016-07-02 01 Sp)" — CC BY-SA 2.0 de
+0-718-cayman-s.jpg   "Porsche 718 Cayman S back IMG 0704" by Alexander Migl — CC BY-SA 4.0 (floor extended to 16:9)