feat: seed downloads by default (opt-out) with robust resume and clean quit

Finished downloads now keep seeding automatically and you opt out per item with
p, reusing the live torrent instead of tearing it down. Resume and restore seed
from the .torrent metadata captured at download time, so they verify the local
file immediately rather than depending on re-fetching metadata from the swarm.

Quitting now flushes queue, history, and seeds synchronously and exits
immediately, fixing the hang when quitting while seeding or with a paused seed.
Paused seeds persist their state and stay paused across restarts. Hide the
hardware cursor on the splash, and clarify that c removes a finished item the
same way in Downloads and Seeding.

Tests are isolated from the real data dir via a TORLINK_STATE_DIR override plus
vitest config, so runs never touch user data. Adds scripts/verify-seeding.ts
(npm run verify:seeding), an offline-deterministic harness proving seed, pause,
and resume transfer real bytes.

README.md

@@ -2,7 +2,7 @@
   <img src="preview/splash.svg" alt="torlink, curated torrents straight from your terminal" style="max-width: 832px; width: 100%; height: auto;">
 </p>
 
-torlink is a torrent finder that lives in your terminal, with zero setup and nothing to configure. One search checks a short, curated list of reputable sources at once, and whatever you pick downloads straight to your computer, never seeding back out. The files are yours, saved to your downloads folder.
+torlink is a torrent finder that lives in your terminal, with zero setup and nothing to configure. One search checks a short, curated list of reputable sources at once, and whatever you pick downloads straight to your computer. The files are yours, saved to your downloads folder.
 
 ## Get started
 
@@ -34,7 +34,7 @@ Type what you're looking for and press Enter. Results stream in from every sourc
 
 Active downloads sit up top with their progress, speed, and time left; when one finishes it drops into Recently downloaded just below, so the list stays tidy. Everything's still there when you come back, and anything interrupted picks up where it left off.
 
-Downloads run in the background while you keep searching, so you can queue up as many as you want. They save to your downloads folder, and the Downloads pane keeps tabs on each one.
+Downloads run in the background while you keep searching, so you can queue up as many as you want. They save to your downloads folder, and the Downloads pane keeps tabs on each one. When something finishes it keeps seeding automatically so the next person can find it too, and the Seeding tab lets you pause or stop that anytime. Pressing `c` on a finished item removes it from your history and stops seeding it, the same whether you do it in Downloads or Seeding.
 
 <p align="center">
   <img src="preview/downloads.svg" alt="torlink's Downloads pane: live progress on top, recently downloaded below" style="max-width: 832px; width: 100%; height: auto;">
@@ -72,6 +72,10 @@ To run or work on torlink locally:
    npx torlink
    ```
 
+## Privacy
+
+Your files stay on your disk, and nothing routes through a central server; torlink only talks to the torrent network directly. Once a download finishes it keeps seeding by default, sharing it back so the next person can find it just as easily. The network only works because people pass things along, and even a few minutes makes a real difference. If you'd rather not, opt out anytime: open the Seeding tab, press `p` to pause or stop any item, and press it again to pick it back up. Always your call.
+
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