chore: add sproutclaw git workflow and track local extensions

Document main/upstream-sync/feature branch strategy, add sync/push
scripts, track .pi/agent extensions and webui in git, and disable
startup changelog via showChangelogOnStartup.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/new-feature.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+# Create a feature branch from latest main.
+set -euo pipefail
+
+if [[ $# -lt 1 ]]; then
+	echo "Usage: $0 <feature-name>" >&2
+	echo "Example: $0 webui-avatar-fix" >&2
+	exit 1
+fi
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT"
+
+NAME="$1"
+BRANCH="feature/$NAME"
+
+git checkout main
+git pull --ff-only origin main 2>/dev/null || true
+git checkout -b "$BRANCH"
+
+echo "Created and switched to $BRANCH"

scripts/push-sproutclaw.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# Push main (and upstream-sync if present) to GitHub and Gitea.
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT"
+
+export GIT_HTTP_VERSION="${GIT_HTTP_VERSION:-1.1}"
+
+BRANCH="$(git branch --show-current)"
+if [[ "$BRANCH" != "main" ]]; then
+	echo "Checkout main before pushing (current: $BRANCH)" >&2
+	exit 1
+fi
+
+echo "==> Push main -> origin (GitHub)"
+git push origin main
+
+if git show-ref --verify --quiet refs/heads/upstream-sync; then
+	echo "==> Push upstream-sync -> origin"
+	git push origin upstream-sync
+fi
+
+if git remote get-url gitea &>/dev/null; then
+	echo "==> Push main -> gitea"
+	git push gitea main
+	if git show-ref --verify --quiet refs/heads/upstream-sync; then
+		git push gitea upstream-sync
+	fi
+fi
+
+echo "Done."

scripts/sync-upstream.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+# Merge upstream pi-mono into upstream-sync, then into main.
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT"
+
+export GIT_HTTP_VERSION="${GIT_HTTP_VERSION:-1.1}"
+
+echo "==> Fetch upstream (badlogic/pi-mono)"
+git fetch upstream
+
+CURRENT="$(git branch --show-current)"
+if [[ "$CURRENT" != "main" && "$CURRENT" != "upstream-sync" ]]; then
+	echo "Switch to main or upstream-sync first (current: $CURRENT)" >&2
+	exit 1
+fi
+
+echo "==> Update upstream-sync from main"
+git checkout upstream-sync 2>/dev/null || git checkout -b upstream-sync main
+git merge main --ff-only
+
+echo "==> Merge upstream/main into upstream-sync"
+if ! git merge upstream/main -m "merge: sync upstream pi-mono main"; then
+	echo
+	echo "Conflicts detected. Resolve them, then:"
+	echo "  git add <resolved-files>"
+	echo "  git commit"
+	echo "  git checkout main && git merge upstream-sync"
+	echo "  ./scripts/push-sproutclaw.sh"
+	exit 1
+fi
+
+echo "==> Merge upstream-sync into main"
+git checkout main
+git merge upstream-sync --ff-only
+
+echo "==> Install deps and build"
+npm install --ignore-scripts
+npm run build
+
+echo
+echo "Done. Push with: ./scripts/push-sproutclaw.sh"
+echo "Conflict hints:"
+echo "  README.md, sproutclaw patches     -> keep ours"
+echo "  package-lock.json, *.generated.ts -> take upstream, then npm install"