docs: add RSS-BOOKSTORE sibling link, remove internal files

- Add Related Project section linking to RSS-BOOKSTORE
- Remove PORTIERUNGSPLAN.md (internal file, not for public repo)
- Remove llms.txt from git tracking (not published)
- Update CHANGELOG and package description

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Lukas Geiger

CHANGELOG.md

@@ -3,10 +3,6 @@
 ## [Unreleased]
 
 ### Added
-- Added `PORTIERUNGSPLAN.md` with a usecase-based platform strategy for browser-store distribution, Firefox feasibility, and explicit non-goals for native desktop/mobile/PWA lines.
-- Added `llms.txt` with canonical links, feature summary, developer commands, and search phrases for crawler/LLM discovery.
-- Added README links to the live Chrome Web Store listing and GitHub Releases page.
-- Added README product screenshot gallery using the existing store screenshots.
 - Added options-page lifecycle diagnostics for service-worker boot, alarm cadence, and recent update-cycle activity.
 - Added automated light/dark theme coverage for popup and options CSS variables.
 - Added a read-only GitHub Actions CI workflow for the Node test suite.
@@ -23,11 +19,10 @@
 - Normalized the German locale file to real UTF-8 Umlaute instead of escaped code points.
 
 ### Changed
-- Clarified README positioning for bookmark-based RSS reader and Chrome Web Store search queries.
 - Added repository line-ending rules, explicitly ignored local pytest caches, and updated the README Edge packaging note.
 
 ### Verified
-- `npm test` now covers 34 dependency-free Node tests, including the 10-feed parser matrix, CDATA cleanup, theme, service-worker scheduling, lifecycle diagnostics, and package-content coverage.
+- `npm test` now covers 33 dependency-free Node tests, including the 10-feed parser matrix, CDATA cleanup, theme, service-worker scheduling, lifecycle diagnostics, and package-content coverage.
 - `npm run package` creates `dist/RSS-BOOK-v1.1.2-edge.zip` with the Manifest V3 runtime files plus license/privacy docs.
 
 ## [1.1.2] — 2026-04-30

PORTIERUNGSPLAN.md

@@ -163,6 +163,17 @@ RSS-BOOK/
 `browser bookmark feed reader`, `Manifest V3 RSS`, `OPML import export`,
 `privacy-first RSS reader`, `no-account feed reader`, `Edge RSS extension`.
 
+## Related Project / Geschwisterprojekt
+
+| Projekt | Distribution | Sync | Native Messaging |
+|---|---|---|---|
+| **RSS-BOOK** (dieses Projekt) | Chrome Web Store + GitHub | Einweg (Feeds → Lesezeichen) | Nein |
+| [RSS-BOOKSTORE](https://github.com/file-bricks/RSS-BOOKSTORE) | GitHub / Sideloading | Bidirektional (Lesezeichen ↔ Ordner) | Ja |
+
+RSS-BOOKSTORE is the power-user edition: it adds a Native Messaging host and
+bidirectional sync between browser bookmarks and a local Windows folder.
+It requires a manual sideload installation and a Python runtime.
+
 ## License
 
 [MIT](LICENSE)

README.md

@@ -3,7 +3,7 @@
   "version": "1.1.2",
   "private": true,
   "type": "module",
-  "description": "Privacy-first Manifest V3 RSS/Atom reader that saves feed entries as browser bookmarks.",
+  "description": "Manifest V3 RSS/Atom to bookmarks browser extension.",
   "scripts": {
     "package": "node scripts/package-extension.mjs",
     "test": "node --test tests/*.test.mjs"