Merge wip/v2-cutover into master

Promote v2 design to canonical. Old templates replaced in place at
existing URLs; v2 scaffolding (templates, plugin, /v2* routes) removed;
style.css and sections.js retired.

Live URLs unchanged: /, /writings/, /<slug>/, /pages/<slug>/.
404 now: /v2home/, /v2writings/, /v2theforge/, /v2/<slug>/, /v2/pages/<slug>/.
Book at /book/ unaffected.

Author: Sohailm25

history/2026-05-19-v2-cutover-plan.md

@@ -45,22 +45,9 @@
 PAGE_SAVE_AS = "pages/{slug}/index.html"
 ARTICLE_URL = "{slug}/"
 ARTICLE_SAVE_AS = "{slug}/index.html"
-DIRECT_TEMPLATES = ("index", "archives", "v2_index", "v2_archives", "v2_theforge")
+DIRECT_TEMPLATES = ("index", "archives")
 ARCHIVES_SAVE_AS = "writings/index.html"
 
-# v2 parallel deployment — same article/page data, rendered through v2_*.html templates
-# at /v2home/, /v2writings/, /v2theforge/, plus per-article /v2/<slug>/ via the
-# v2_router plugin. Old site remains unchanged.
-V2_INDEX_SAVE_AS = "v2home/index.html"
-V2_INDEX_URL = "v2home/"
-V2_ARCHIVES_SAVE_AS = "v2writings/index.html"
-V2_ARCHIVES_URL = "v2writings/"
-V2_THEFORGE_SAVE_AS = "v2theforge/index.html"
-V2_THEFORGE_URL = "v2theforge/"
-
-PLUGIN_PATHS = ["plugins"]
-PLUGINS = ["v2_router"]
-
 TAG_SAVE_AS = ""
 CATEGORY_SAVE_AS = ""
 AUTHOR_SAVE_AS = ""