todo: one file per item, grouped by theme, with a generated index

TODO.md had reached 1050 lines and 72 open items across 28 sections, read mostly
on a phone. It is now a directory: todo/<theme>/<item>.md, one card per file, with
frontmatter carrying id, status, created date and order, and the prose body copied
across verbatim. TODO.md becomes a generated index (bun run todo:index).

Dates: where an item's prose stated one it is used; otherwise its old section's;
otherwise 2026-08-20, floored at the day before the split rather than invented.
date_source records which.

Shaped for a two-way Kanban board, filed as todo/tooling — a card is a file, id is
the identity, frontmatter is the machine's half and the body is the owner's.

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

todo/plugin-repos/12-stale-headscale-route-paths-in-comments.md

@@ -0,0 +1,13 @@
+---
+id: plugin-repos/12-stale-headscale-route-paths-in-comments
+title: "~12 stale `/headscale` route paths in comments across `web/`, plus `App.tsx:78` in the platform"
+theme: plugin-repos
+status: done
+created: 2026-08-21
+date_source: stated
+order: 4
+---
+
+~12 stale `/headscale` route paths in comments across `web/`, plus `App.tsx:78` in the platform.
+**Done.** Verified 2026-08-21: none left in either. The one remaining mention is a form
+placeholder, `https://headscale.example.com`, which is correct — that IS a Headscale URL.