refactor(docs): co-locate k8s/proxmox docs with their code + fix broken perf paths

Docs moved from docs/k8s -> k8s/docs and docs/proxmox -> proxmox/docs to sit
beside their code. Updated all cross-references (docmap, STATUS, README, AGENTS,
k8s README). Fixed SCRIPT_DIR path resolution in 3 perf scripts broken by the
reorg (deploy-check/and-fix/finish-host pointed at root/scripts instead of
perf/scripts). Registered the new top-level proxmox/ dir in all listings.

💘 Generated with Crush

Assisted-by: Crush:glm-5.2

AGENTS.md

@@ -11,13 +11,14 @@ lives in subdirectories.
 provisioning/        Server provisioning (SetupNewSystem.sh, security, 2FA)
 tests/               Test suite + VM validation harness
 dns-cluster-setup/   Technitium DNS cluster replication
-k8s/                 k3s cluster setup scripts (3-node HA over Tailscale)
+k8s/                 k3s cluster setup scripts (3-node HA over Tailscale) + docs/
 powerman/            Cyclades PM10i PDU management via powerman
 console/             Serial console management (ser2net + conman) for switches
 perf/                Proxmox perf tuning, fleet audit, iperf
+proxmox/             Proxmox fleet docs (hardware audit, capacity, k8s host planning)
 netinfra/            pfv-netinfra-01/02 DNS/NTP setup
 switches/            Switch configuration captures
-docs/                All documentation (see docs/docmap.md)
+docs/                Server-build docs, docmap index, and archive
 vendor/              Vendored KNELShellFramework
 ```
 
@@ -94,4 +95,4 @@ vendor/              Vendored KNELShellFramework
 Solo-founder R&D Proxmox cluster in a private residence. Shoestring budget.
 Production lives on a Cloudron VPS in Reston VA. See
 [`STATUS.md`](STATUS.md) for current state and
-[`docs/proxmox/PROJECT.md`](docs/proxmox/PROJECT.md) for the fleet report.
+[`proxmox/docs/PROJECT.md`](proxmox/docs/PROJECT.md) for the fleet report.