README + danctnix-besser-pkgbuild/README: point at kernel-agent pkgrel=4 flow

- Top-level README: add kernel-agent + marfrit-packages repos to the
  Repos table; mark this hand-managed pkgbuild dir as historical.
- danctnix-besser-pkgbuild/README: add a "MOVED" banner pointing at
  marfrit/marfrit-packages/arch/linux-pinetab2-danctnix-besser/ as the
  canonical PKGBUILD home from pkgrel=4 onwards. Refresh the TL;DR
  table (pkgrel=4, new cumulative b2sum bd42cd39..., new "Patch
  manifest" row). Add a pkgrel history table. Update Building
  section with the kernel-agent flow (and keep the hand-managed flow
  as DEPRECATED for reference). Update Installing + Verifying
  examples to pkgrel=4. Update Maintenance plan.

Refs: kernel-agent#28, marfrit-packages#28, kernel-agent#29 (per-series
reconstruction follow-up).

README.md

@@ -53,6 +53,9 @@ CW1200-ancestry markers in current source: same author Dmitry Tarnyagin,
 |------|------|
 | **This umbrella** | `git.reauktion.de/marfrit/besser` — patches/, scripts/, fw-analysis/, notes/ |
 | **Mobian DKMS fork** (PR target) | `git.reauktion.de/marfrit/bes2600-dkms` — branches per patch; upstream = `salsa.debian.org/Mobian-team/devices/bes2600-dkms` |
+| **DanctNIX kernel package** (ohm) | `git.reauktion.de/marfrit/marfrit-packages/arch/linux-pinetab2-danctnix-besser/` — kernel-agent-driven PKGBUILD, pkgrel=4+ |
+| **kernel-agent manifest + patches** | `git.reauktion.de/marfrit/kernel-agent` — `fleet/ohm.yaml` lists the per-patch series, `bin/ka-promote ohm` emits the cumulative the PKGBUILD consumes |
+| **Historical hand-managed PKGBUILD** | `git.reauktion.de/marfrit/besser/danctnix-besser-pkgbuild/` — pkgrel≤3, deprecated; see directory README |
 
 ## Patch series