Fix System page crash, retire "held" copy, and slim CLAUDE.md

- system.html crashed with a 500 whenever SABnzbd history loaded: the
  trend() macro compared the formatted "avg_speed" string (e.g. "900
  KB/s") against a number. Added a real numeric avg_speed_kbps field
  and pointed the macro at that instead.
- Replaced "held"/"not held" wording with "in library"/"not in
  library" on Home and Discover.
- Moved CLAUDE.md's Deployment/reverse-proxy and account-management
  sections into two on-demand skills (deploy-arr-summary,
  manage-accounts) so they only load when actually relevant, with a
  one-line pointer left in their place.
- Updated PRODUCT.md's restructure note now that meridian-marquee has
  merged to main.
- Dropped two stale/broken entries from settings.local.json's
  permission allowlist (a rule from a different machine/path, and one
  with a corrupted token).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NBw1QodG8ZMYHrGeQfqyDS

PRODUCT.md

@@ -53,16 +53,19 @@ so this is not optional). Session-based login (single shared password or
 per-user accounts) gates the whole app; there's no public/unauthenticated
 view.
 
-**In-progress restructure (branch `meridian-marquee`):** the app is
-splitting from one long single-page dashboard into focused pages — Home
-("marquee": what's playing, one line of system state, what's new),
-Watch, Library, Discover, Requests, System, Activity — each answering one
-question well rather than one long scroll trying to show everything.
-This also resolves cases where a content-heavy section (e.g. the per-disk
-storage list) would otherwise force awkward row heights on a shared
-"Right now" strip. `_shell.html` and `_macros.html` are new shared-layout
-scaffolding for this split; `dashboard.html` is the outgoing single-page
-template being superseded by `home.html` + the per-page templates.
+**Multi-page restructure (shipped 2026-08-29, `meridian-marquee` merged
+to `main`):** the app split from one long single-page dashboard into
+focused pages — Home/P100, Watch, Library, Discover, Requests, System,
+Activity — each answering one question well rather than one long scroll
+trying to show everything. This also resolved cases where a content-heavy
+section (e.g. the per-disk storage list) would otherwise force awkward
+row heights on a shared "Right now" strip. `_shell.html` and
+`_macros.html` are the shared-layout scaffolding; `dashboard.html` (the
+old single-page template) was deleted, superseded by `home.html` + the
+per-page templates. Landed together with the visual redesign in
+Brand Commitments below — see DESIGN.md and
+`static/css/base.css`'s header comment for the visual system's own
+invariants.
 
 Each page fetches only the services it needs (e.g. `/watch` fetches only
 Tautulli) rather than the old single route's all-services-at-once fetch —