Add blankpad-host auto-learn skills and memory store

Tracked the harness artifacts accumulated on blankpad (blank@), matching
the existing convention for the --home-dank-* memory stores and the 36
already-tracked managed-skills.

managed-skills (9): authentik-proxy-provider-app-link,
dankclaw-guard-chain-layer-diagnosis, e2e-arr-rawip-reachability-triage,
halogen-kv-pool-fit, lan-client-split-dns-fix, noctalia-reference,
rootless-quadlet-log-retrieval, ssh-key-bootstrap-no-sshpass,
swapfile-resize-safe-ordering.

memories (2 stores): --home-blank-.omp-- (dotfiles_git, handy_lifecycle,
input_permissions) and --home-blank-Projects-serverAppConfig--
(frank_large_quadlet).

Secret sweep before staging: no PEM blocks, no credential literals.
Content is fleet topology/IPs only, same class as the tracked dank stores.

agent/memories/--home-blank-.omp--/skills/input_permissions/SKILL.md

@@ -0,0 +1 @@
+Resolve /dev/input permission denied errors. Targets root:input group assignment (660 permissions), sudo/PTY requirements, and /etc/passwd locking.

agent/memories/--home-blank-.omp--/skills/input_permissions/examples/permission_pitfalls.md

@@ -0,0 +1,2 @@
+1. usermod without sudo fails to lock /etc/passwd.
+2. sudo password entry in CLI requires PTY for reliable input.

agent/memories/--home-blank-.omp--/skills/input_permissions/scripts/fix_input_group.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+# Adds user to input group, requires sudo to lock /etc/passwd and PTY for CLI password
+sudo usermod -aG input $USER

agent/memories/--home-blank-.omp--/skills/input_permissions/templates/dev_input_check.md

@@ -0,0 +1,3 @@
+Diagnose /dev/input/* nodes: ls -la /dev/input
+Check groups: groups $USER
+Expected: root:input with crw-rw---- (660)