docs: remove the finished plan 004 (the spec is the record)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/plans/004-kakaopage.md

@@ -1,34 +0,0 @@
-# KakaoPage source — implementation plan
-
-> superpowers:executing-plans (native). **Spec:** [`docs/specs/004-kakaopage.md`](../specs/004-kakaopage.md).
-
-**Goal:** a `kakaopage` Source registered next to `webtoons` and `tapas`, plus per-host request headers.
-
-## Global constraints
-`src/core` pure; tests offline on captured fixtures (done); no new dependencies.
-
-## Review focus
-1. `seriesId=N` must not match `N0` in Wayback rows. → Task 1 test, Task 4 history test.
-2. A series without `land_thumbnail` (19+ edition) → one cover, no crash. → Task 3 test.
-3. Old `dn-img-page.kakao.com …&filename=th3` URLs normalise to the original. → Task 1 test.
-4. The Referer reaches `bff-page.kakao.com` through both the server proxy and the userscript. → Task 2 tests.
-5. An unknown id gives a clear error. → Task 4 test.
-
-### Task 1: URLs (`kakaopage/urls.ts`)
-- [x] Links (`/content/N`, `/home?seriesId=N`, `m.`), rejects; `normalizeImageUrl`; `isSameKakaoSeries`;
-  `overviewUrl(id)`. RED → GREEN → commit.
-
-### Task 2: Request headers (`core/transport.ts`, `server/app.ts`, `userscript/gm.ts`)
-- [x] `requestHeadersFor(url)`; the server proxy and `gmTransport` send it (tests on both). RED → GREEN → commit.
-
-### Task 3: Parsing (`kakaopage/parse.ts`)
-- [x] `parseOverview(json)` (comic, novel, 19+ without land thumbnail, error body); `extractCovers(html, pageUrl)`
-  for 2020/2022/2024 captures. RED → GREEN → commit.
-
-### Task 4: Source and registry
-- [x] `kakaopage` Source through `FakeTransport` (resolve, currentCovers, unknown id, Wayback over both CDX
-  fixtures keeps only this id); registry, allowlists, `@connect`, hint copy; README, ARCHITECTURE, DECISIONS.
-  RED → GREEN → commit.
-
-### Task 5: Verify and finish
-- [x] Real run in headless Chrome; final review; remove this plan; merge; push.