test: e2e smoke; docs: README; ci: release workflow

Co-Authored-By: Claude

scripts/e2e.sh

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+#!/usr/bin/env bash
+# End-to-end test driver: builds the plugin, provisions an isolated Obsidian
+# vault + config with the plugin installed and enabled, then runs the Playwright
+# spec against the real Obsidian binary under a virtual X display.
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT"
+
+CACHE="${OBSIDIAN_CACHE:-$HOME/.cache/obsidian-e2e}"
+APPIMAGE="$CACHE/Obsidian.AppImage"
+SQUASHFS="$CACHE/squashfs-root"
+E2E_DIR="$ROOT/.obsidian-e2e"
+VAULT="$E2E_DIR/vault"
+CONFIG_HOME="$E2E_DIR/config"
+
+if [[ ! -f "$APPIMAGE" ]]; then
+  echo "Obsidian AppImage not found at $APPIMAGE." >&2
+  echo "Download it from https://obsidian.md/download and place it there." >&2
+  exit 1
+fi
+
+# Extract the AppImage once so we can launch the inner Electron binary directly.
+if [[ ! -x "$SQUASHFS/obsidian" ]]; then
+  echo "==> Extracting Obsidian AppImage"
+  ( cd "$CACHE" && "$APPIMAGE" --appimage-extract >/dev/null )
+fi
+export OBSIDIAN_BIN="$SQUASHFS/obsidian"
+
+echo "==> Building plugin"
+npm run build >/dev/null
+
+echo "==> Provisioning isolated vault + config at $E2E_DIR"
+rm -rf "$E2E_DIR"
+PLUGIN_DIR="$VAULT/.obsidian/plugins/jekyll-publish"
+mkdir -p "$PLUGIN_DIR" "$CONFIG_HOME/obsidian"
+
+cp dist/main.js dist/manifest.json dist/styles.css "$PLUGIN_DIR/"
+# Enable our community plugin (and disable Obsidian's first-run restricted mode prompt).
+printf '["jekyll-publish"]\n' > "$VAULT/.obsidian/community-plugins.json"
+
+# Create a test note so the publish command has an active file.
+cat > "$VAULT/Test.md" <<'MD'
+---
+title: E2E Test Post
+date: 2024-01-01
+---
+
+# E2E Test Post
+
+This is a test note for the E2E smoke test.
+MD
+
+# Register the vault and mark it open so Obsidian boots straight into it.
+VAULT_ESCAPED=$(printf '%s' "$VAULT" | sed 's/[\/&]/\\&/g')
+cat > "$CONFIG_HOME/obsidian/obsidian.json" <<JSON
+{"vaults":{"e2e0000000000000":{"path":"$VAULT_ESCAPED","ts":1700000000000,"open":true}}}
+JSON
+
+export XDG_CONFIG_HOME="$CONFIG_HOME"
+
+echo "==> Running Playwright (xvfb + real Obsidian)"
+xvfb-run -a --server-args="-screen 0 1280x900x24" npx playwright test "$@"