chore(archive): preserve KNELServerBuild remainder + layout notes [#474]

Archive the non-ported remainder of the legacy KNELServerBuild repo
under archive/KNELServerBuild/ with its original structure intact,
completing the legacy repo merge for everything except the live
LibreNMS patterns (ported in the previous commit).

Exclusions:
- .git history (superseded; legacy repo remains at its original path)
- ported files (Agents/librenms, Modules/OAM/oam-librenms.sh,
  ConfigFiles/SNMP/snmp-sudo.conf)
- vendored KNELShellFramework tree (byte-identical duplicate of the
  copy already vendored at vendor/ in this repo)
- SSH authorized-keys files (live access-control material; carrying
  them in an archive invites drift — key policy lives elsewhere)

The whole tree is skip-listed in tests/shellcheck.sh (archived legacy
code, not maintained — same standing as vendor/); check-rules.sh
already prunes archive/. Rule 9 (conflict markers) now also excludes
archive/ staged files: preserved-verbatim legacy scripts contain
decorative "====" banners that false-positive as conflict markers
(same archive exclusion precedent as rule 11).

AGENTS.md: note archive/KNELServerBuild and oam/librenms-agent in the
Repository Layout, and fix the stale KNELIAC path to
/home/reachableceo/projects/KNEL/KNELIAC.

💘 Generated with Crush

Assisted-by: Crush:glm-5.2

archive/KNELServerBuild/README.md

@@ -0,0 +1,21 @@
+# KNEL FetchApply
+
+## Repo Issues
+https://projects.knownelement.com/project/reachableceo-vptechnicaloperations/timeline
+
+## Repo Discussion
+https://community.turnsys.com/c/chieftechnologyandproductofficer/26
+
+
+## Repo discription 
+Known Element Enterprises (the entity serving as the TSYS Group management company) (through it’s executive leader, the COO) provides core IT/back office systems/services/support on a hands off/fully delegated authortity basis to the CCO and the orgs/members.
+
+One of those functions is the provisoning of Linux servers. This repository is the Infrastructure As Code (IAC) repository for TSYS. 
+
+In the future it will be used via FetchApply https://github.com/P5vc/fetch-apply
+
+## Usage
+
+git clone this repo
+cd FetchApply/ProjectCode
+bash SetupNewSystem.sh