Add CLAUDE.md, collection scaffold, and MemPalace wing

Establish this repo as a collection of independent script folders for the
self-hosted environment (odin, an Unraid host).

- CLAUDE.md: repo conventions, the odin stack, and MemPalace usage. The
  infrastructure facts are carried over from the FamilySync project, where
  they are documented and verified; the mapping of the name "odin" to that
  host is assumed and flagged for confirmation, along with the SSH/deploy
  gaps marked "?".
- Core rule: each collection is a self-contained top-level folder owning its
  own docs, config, and dependencies. No shared/ or utils/ at the root —
  duplication is preferred over coupling so a collection stays independently
  deletable.
- _template/: scaffold making that rule concrete. The bash entrypoint ships
  strict mode, --dry-run, and a required-env guard (all four paths tested).
- mempalace.yaml: wing "odin-scripts", set explicitly because basename
  auto-detection would produce the colliding wing "scripts". Tracked rather
  than gitignored so a fresh clone keeps the config; entities.json stays
  ignored.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

_template/bin/example

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+# Template entrypoint. Copy, rename, and replace main().
+set -euo pipefail
+
+readonly SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+readonly COLLECTION_DIR="$(dirname "$SCRIPT_DIR")"
+
+DRY_RUN=0
+
+usage() {
+  cat <<'EOF'
+Usage: example [--dry-run] [--help]
+
+  --dry-run   Show what would happen without changing anything.
+  --help      Show this message.
+EOF
+}
+
+log()  { printf '%s\n' "$*"; }
+warn() { printf '%s\n' "$*" >&2; }
+die()  { warn "error: $*"; exit 1; }
+
+# Run a mutating command, or describe it under --dry-run.
+run() {
+  if (( DRY_RUN )); then
+    log "[dry-run] $*"
+  else
+    "$@"
+  fi
+}
+
+load_env() {
+  local env_file="$COLLECTION_DIR/.env"
+  [[ -f "$env_file" ]] || return 0
+  set -a; . "$env_file"; set +a
+}
+
+main() {
+  while (( $# )); do
+    case "$1" in
+      --dry-run) DRY_RUN=1 ;;
+      --help|-h) usage; exit 0 ;;
+      *) die "unknown argument: $1" ;;
+    esac
+    shift
+  done
+
+  load_env
+  : "${EXAMPLE_HOST:?EXAMPLE_HOST is not set — see .env.example}"
+
+  log "target: $EXAMPLE_HOST"
+  run true  # replace with the real work
+}
+
+main "$@"