Closes#98.
comix.to began answering plain-TLS fetches with a Cloudflare JavaScript
challenge on 2026-08-12, so every poll got a 403 interstitial. Its cover host
`static.comix.to` is gated the same way. comix therefore joins kagane and
novelfull as a browser-backed Site.
## What changed
- **Registry** (`internal/latest/sites.go`): comix gains a `Browser` entry —
`comixRead`, `Done: body != "" && !isInterstitial(body)`, `Fallback: false`.
Skip-when-no-browser falls out of the existing routing; no site-string compare
was added anywhere.
- **Read shape** (`internal/latest/browser.go`): an in-tab `fetch()` of the
Series URL, not a DOM render. comix is an SPA — rendering it costs ~65
requests for the same server-rendered HTML one fetch returns (24.5 KB,
~480 ms measured). `comixSeriesPageURL` pins scheme + host + `/title/<slug>`
and rebuilds the address, so a client-supplied `series_url` cannot aim the
browser anywhere else.
- **Cover bytes**: `comixImageURLRe` pins `https://static.comix.to/<path>.<ext>`;
`BrowserFetcher.Image` now gates on `browserOnlyCoverURL` rather than a
kagane-only regex, so both Sites' image URLs route through the one path.
Bytes come from direct navigation, not a page-context fetch — comix's Series
page sets `cross-origin-embedder-policy: require-corp`, which fails one.
- **Parsers and stored Series identity: untouched.** The in-tab body is the same
server-rendered HTML the existing fixtures were cut from.
## Verification
- `go test ./...` green (needs Docker).
- New seam tests: comix routes to the browser when one is configured, and is
not fetched at all when none is (`TestComixUsesBrowserFetcher`,
`TestComixSkippedWhenNoBrowserFetcher`); URL-pin and cover-gate table tests.
- Live proof against the real browser unit, `TestSmokeComix` (env-gated):
page 24793 bytes in one in-tab fetch, chapter 53, cover accepted by the pin,
26862 bytes of `image/jpg` retrieved.
- Two-axis review run; findings were stale comments on `BrowserFetcher`, `Get`
and the `Fallback` field, fixed in f000cc7.
Docs updated: root `AGENTS.md` (constraint + smoke command, including the note
that this dev machine's ISP DNS-hijacks `comix.to`), `backend/AGENTS.md`
(poller, cover pipeline, `BROWSER_WS_URL`), `REDEPLOY.md` §8 degrade note.
Reviewed-on: #105
Co-authored-by: Sulthan Zaki <sultankiki05@gmail.com>
Co-committed-by: Sulthan Zaki <sultankiki05@gmail.com>
