docs: user edits to English README callout + gitignore update

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

.gitignore

@@ -11,3 +11,4 @@ _notes/
 _tmp_*
 test-project/
 .venv*/
+.gstack/

README.en.md

@@ -20,7 +20,7 @@
 
 Open-source CLI agent that autonomously writes, audits, and revises novels — with human review gates that keep you in control.
 
-**Native English support** — 10 built-in English genre profiles with dedicated pacing rules, fatigue word lists, and audit dimensions. See [English Genre Profiles](#english-genre-profiles) for details.
+**Native English support** — 10 built-in English genre profiles with dedicated pacing rules, fatigue word lists, and audit dimensions. See [README for detail](#english-genre-profiles).
 
 ## Quick Start