Initial commit: the public installer

install.sh and install.ps1, copied from the agent-standups source repo, which
stays private. Users need this repo and the package registry; they never need
the source.

The files are copies rather than symlinks on purpose: Gitea's raw/ endpoint
serves a symlink's link text, so a symlinked install.sh would pipe a relative
path into the user's shell instead of a script. sync.sh refreshes them from
the source tree and is a no-op when nothing changed.

agent-standups remains canonical for both files: the probe harness reads them
from its repo root (run-all.sh passes $REPO/install.sh to the R06 probes) and
P8-24 copies them into a scratch tree.

Signed-off-by: disqualifier <dev@disqualifier.me>

sync.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+# Copy the installers from the source repo into this one.
+#
+# agent-standups is canonical: install.sh and install.ps1 are tracked there,
+# the probe harness reads them from the repo root (run-all.sh passes
+# $REPO/install.sh to the R06 probes), and P8-24 copies them. This repo is the
+# public face, so the files are copied rather than symlinked -- Gitea's raw/
+# endpoint serves a symlink's link text, which would pipe a path into the
+# user's shell instead of a script.
+#
+# Run this before committing here, whenever the installers change.
+set -eu
+
+SRC="${1:-../agent-standups}"
+[ -f "$SRC/install.sh" ] || { echo "error: no install.sh under $SRC" >&2; exit 1; }
+
+changed=0
+for f in install.sh install.ps1; do
+  if ! cmp -s "$SRC/$f" "$f" 2>/dev/null; then
+    cp "$SRC/$f" "$f"
+    echo "  updated $f"
+    changed=1
+  fi
+done
+chmod +x install.sh
+
+[ "$changed" = 1 ] || echo "  already in sync with $SRC"